Speed limits in the United States by jurisdiction

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Speed ​​limits in the United States vary depending on jurisdiction, with 75 to 80 mph (120-130 km/h) common in the western United States and 65 to 75 mph (100 to 120 km/h) in the Eastern United States. Countries can also set specific speed limits for trucks and night trips along with a minimum speed limit. The highest speed limit in the country is 85 mph (140 km/h), which is installed on a stretch of toll road in rural Texas.

Video Speed limits in the United States by jurisdiction

Alabama

In Alabama, it is illegal to drive at an unreasonable and wise pace for current conditions and dangers. Drivers also should not drive very slowly thus impeding the flow of traffic. If the speed limit is not posted, it is:

• 30 mph (48 km/h) in urban areas
• 35 mph (56 km/h) on unpaved road
• 45 mph (72 km/h) on paved country roads
• 55 mph (89 km/h) on the other two lane road
• 65 mph (105 km/h) on a four-lane road
• 70 mph (110 km/h) on Interstate Highways

Trucks carrying hazardous materials do not exceed 55 miles per hour (89 km/h).

Maps Speed limits in the United States by jurisdiction

Alaska

In Alaska, many major highways have speed limits of 65 miles per hour (105 km/h), including:

• Most Highway Parks between Fairbanks and Willow (except for slower zones through Nenana, Denali Park, Cantwell, and Healy)
• Most of the Richardson Toll Road between Valdez and the North Pole
• On Glenn Highway, 35 miles (56 km) highway between Wasilla and Anchorage, and most of the 100 miles west of Glennallen
• Seward Highway Highway in Anchorage between 36th Avenue and Rabbit Creek Road, and another non-freeway section of Seward Highway just south of Bird Point
• Mostly the Alaska Highway between the Canadian border and Delta Junction

Minnesota Drive Expressway has a 60 mile/hour speed limit (97 km/h), such as Highway Richardson between Fairbanks and North Pole.

Since the mid-1990s, Alaska's major highways have been gradually increased from 55 mph to 60 or 65 mph. However, some continue to carry the default speed limit of 55 miles per hour (89Ã, km/h), including:

• Sterling Highway
• Tok shortcut
• The Haines Highway
• Parts of Highway Park and Seward Highway establish a "safe zone"
• Part of Elliott Highway and Steese Highway close to Fairbanks

Engineering studies are needed to determine which road segment will post a speed limit higher than 55 miles per hour (89 km/h).

The Dalton Highway and part of Elliot Highway is 50 mph.

The standard speed limits in Alaska are:

• 20 mph (32 km/h) in the alley
• 20 mph (32 km/h) in the business district
• 25 mph (40 km/h) in the residential district
• 55 mph (89 km/h) on the other way

The speed limit when pulling a car home is 45 miles per hour (72 km/h).

src: www.fmcsa.dot.gov

American Samoa

The speed limit in American Samoa is 45 mph (72 km/h), with 25-45 mph (40-72 km/h) in undivided and 20-25 mph (32-40 km/h) in residential areas.

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Arizona

The default speed limit outside the "business or residential" district in Arizona is 65 miles per hour (105 km/h), within that standard speed limit range of 25 miles per hour (40 km/h). The school zone's speed limit is 15 miles per hour (24 km/h), while some may be 25 to 35 miles per hour (40 to 56 km/h). Exceeding these limits is only in the best condition of driving considered prima facie as evidence of speeding. Speed ​​limit changed not prima facie .

The maximum speed limit on Interstate Highways is 75 miles per hour (121 km/h). This limit can be applied outside the "urban area", where speeds of over 85 miles per hour (137 km/h) on any highway (regardless of the posted speed limit) are considered criminal offenses (not civilian). However, Interstate 10 near the California border is reduced to 65 miles per hour (105 km/h). Some parts of Interstate 15 have the same rules because of the sharp curves. There are exceptions to the urban highway at Casa Grande, with a speed limit of 75 miles per hour (121 km/h), while other urban highways are limited to 55 or 65 miles per hour (89 or 105 km/h). In "business or residential" districts, exceeding the speed limit of more than 20 miles per hour (32 km/h) is considered criminal. In "urban areas", 55 miles per hour (89Ã, km/h) speed limit quotations are given for "limited resources wastage". This exception only applies within 10 miles per hour (16 km/h). As long as the speed does not exceed 65 miles per hour (105 km/h), the violation is not recorded as a traffic violation for the purpose of the points system.

Non-passenger vehicles exceeding 13 short tons (12 tons), or "trailer trailer vehicles" weighing more than 3 tons short (2.7 tons) may not exceed 65 miles per hour (105 km/h) sign posted that allows such speed. However this is no different from the default speed limit, and has a practical effect that requires extra consideration to post a standard speed limit mark of more than 65 miles per hour (105 km/h). The non-numerical minimum speed limit is combined with the basic speed rules in Arizona, which also prohibit higher speeds than is "reasonable and prudent".

Night speed limit signs are posted on several streets within Tucson city limits that do not have streetlights. Example: Fort Lowell Road from Oracle Road to Country Club Road, 22nd Street from Interstate 10 to Cherry Avenue.

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Arkansas

The urban district is by default posted at 30 mph (48 km/h). Outside of the city limits, two-state roads and federal highways have a speed limit of 55 mph (89 km/h) unless otherwise posted, and 2 county road lanes have a speed limit of 45 mph (72 km/h) unless otherwise posted. In June 2015, the Arkansas Highway Commission authorized the Arkansas Highway and Transportation Department (AHTD) to raise the speed limit on 4 and 5 lanes of inseparable from 55 to 60 mph (89 to 97 km/h) while 4 split lane roads were set to go from 55 to 65 mph (89 to 105 km/h), this change affects 285 miles (459 km) from the Arkansas highway. Furthermore, AHTD has set a standard highway speed limit. Along the rural highway, the boundary is 70 mph (110 km/h), while the suburban highway is parked at 65 mph (105 km/h). The school zone speed limits apply only when children are present, or when flares are lit when provided and the speed limit is set at 25 mph (40 km/h) unless otherwise posted. It is however quite common that schools that only serve higher grade levels will not have school speed limits in rural areas or where the school is located more than 500 feet (150 m) from the highway or road.

On March 16, 2017, Arkansas House introduced a bill that would allow the state toll commission to increase speed limits up to 75 mph on rural interstate highways and set a speed limit of rural non-split highways to 65 mph. The bill becomes law on April 7, 2017.

The new 75 mph (121 km/h) speed limit does not apply to trucks. Trucks will still be limited to 70 mph. (Check the facts, this provision has been removed from law 1097.)

On October 31, 2017, the speed limit legislation was broken down into four categories: rural interstate, Urban Interstate, rural borderless highway, and two lane highways. There are studies conducted to increase rural interstate speed limits up to 75 mph (121 km/h), urban interstate speed limits to unlimited 65 mph (105 km/h) speed limits, unlimited access roads divided into rural areas up to 65 mph (105 km)/h) unless the DOT ensures lower speed, and maintains a 55 mph speed limit (89 km/h) with an option to increase the limit to 60 mph (97 km/h) where a higher speed limit can be guaranteed on two lane highways.

src: www.fmcsa.dot.gov

California

Basic speed law

California's "Basic Speed ​​Law", part of the California Vehicle Code, defines the maximum speed at which a car can travel as a "reasonable and wise" pace, given road conditions. Reasonable speeds may be lower than the posted speed limits in conditions such as fog, heavy rain, ice, snow, gravel, sharp corners, dazzling glare, darkness, crossing traffic, or when there is a blocked view of orthogonal traffic - such as such as road curvature, parked car, vegetation, or snow bank - thereby limiting the Clear Insured Distance (ACDA). The basic velocity law is a statutisation booster of the centuries old legal doctrine of negligence that is specifically applied to the speed of a vehicle. California Vehicle Code Section 22350 is typical; It states that "No one will drive a vehicle on the highway at a greater than normal speed... and in any case at a speed that endangers the safety of a person or property".

The speed limit in California is mandated by the law to be established: (1) at or below the operating speed of the 85th percentile; as determined by traffic and engineering surveys - this is a speed not exceeding 15% of traffic; or (2) the prima facie limit mandated when certain criteria are met as described in the vehicle code. These criteria include school zones, alleys, and residential areas.

If the 85th percentile operating speed measured by Traffic and Engineering Survey exceeds the speed of design, legal protection must be given to that speed - even if it is unsafe with regard to certain technical aspects such as visibility. This creeping rate can continue until the 85th percentile operating speed is proportional to the speed that is psychologically regarded as an uncomfortable danger.

The theory behind California's 85th percentile legislation is that, as a policy, most voters must be viewed as halal, and the constraints must be practical to uphold. However, there are circumstances in which the rider is not likely to process all the risks involved, and as the mass picks the 85th percentile speed poorly. This rule in substance is the process of choosing a speed limit by driving; and different from delegating speed limits to the engineer.

The numerical limit set by Caltrans engineers for speed limit signs, commonly found on all non-controlled access routes, is considered the maximum "reasonable and prudent" speed.

Many speed limit signs are identified as "maximum speed", usually when the limit is 55 mph (89 km/h) or more. When the National Maximum Speed ​​Act is enacted, California is forced to create a new legal mark category, "Maximum Speed", to show the driver that the Basic Speed ​​Law does not apply to speeds above the speed limit mandated by the federal government; on the contrary, would be an offense to exceed the fixed maximum speed indicated on the mark, regardless of whether the driver's speed can be considered "reasonable and prudent".

Drivers may receive traffic citations for violating the Basic Speed ​​Law even though their speed is below the "maximum speed limit" if road conditions, weather, or traffic make the speed unsafe. However, because the Basic Speed ​​Law sets the limits of prima facie, not absolute, they can also defend against quotes to accelerate "by competent evidence that speed exceeds that limit is not a violation of the basic velocity law at that time , place and under existing conditions ", per section 22351 (b) of the California Vehicle Code. As lawyer David W. Brown says in his book Fight Your Ticket & amp; Win in California , "someone traveling over the speed limit - but less than the maximum speed of 65 mph (55 mph for two lanes of undivided highway) - no need to break the law" and that "you can stand up against unlawful allegations Basic Speed ​​not only shows you not exceeding the speed limit, but also by establishing that even if you exceed the limit, your speed remains 'safe' in that state. "

Speed ​​limit

Rural highways, such as parts of I-5, I-8, I-10, I-15, I-40, I-205, I-215, I-505, I-580 (between I-205 and I - 5), US 101 between San Miguel and King City, and SR 99 south of Madera and Fresno, has a speed limit of 70 mph (110 km/h). The highest speed limit on the I-80 is 65 mph (105 km/h) as it passes exclusively urban and mountain areas. However, the speed limit in San Francisco-Oakland Bay Bridge and in San Francisco is only 50 mph (80 km/h). In downtown Los Angeles, the maximum speed limit is 55 mph (89 km/h). This includes the entire length of Pasadena Freeway between Pasadena and downtown Los Angeles, and parts of Hollywood, Santa Ana, Santa Monica, and Harbor Freeways. The standard limit on a 2 lane road is 55 mph (89 km/h). However, Caltrans or local agents can post speeds of up to 65 mph (105 km/h) after engineering studies.

There is a 55 mph speed limit (89 km/h) for trucks with 3 axles or more and all vehicles when towed.

In California, Maximum Speed ​​in the school zone is 15 or 25 mph (24 or 40 km/h), but may only apply when children are present in the school zone.

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Colorado

The maximum speed limit in Colorado is 75 mph (121 km/h) on the rural Interstate highway and part of SH 470 (E-470) toll road, although Interstate 70 in the Rocky Mountains has 65 mph (105 km/h). ) boundary due to steep values ​​and curves and a 50 mph (80 km/h) boundary at the eastern and western edges of the Eisenhower Tunnel. The maximum speed limit on other rural highways is 65 mph (105 km/h).

There is also a prima facie base speed limit in Colorado.

• 20 mph (32 km/h) on a narrow and winding mountain road
• 25 mph (40 km/h) in any business district
• 30 mph (48 km/h) in any residential district
• 40 mph (64 km/h) on an open mountain highway

Night speed limit

On a certain stretch of rural highway, in particular US 160 between Durango and Pagosa Springs and US 550 between Durango and Silverton, night speed limits apply during periods of peak migration to wildlife areas. Fines are getting faster copied when night speed limits apply.

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Connecticut

Speed ​​limits in Connecticut are typically 65 mph (105 km/h) on rural highways; up to 55 mph (89 km/h) in rural divided and up to 50 mph (80 km/h) on undivided rural roads. In urban areas, speed limits vary from 25 mph (40 km/h) on residential streets and central business districts, 30 to 40 mph (48-64 km/h) in arterial roads, and from 45 to 55 mph (72 -89 km)/h) on the urban highway. Limited access divided roads have a minimum speed of 40 mph (64 km/h), but these are not always posted, and are rarely enforced. Connecticut was among the last countries to raise the maximum speed limit of 55 mph (89 km/h) originally established by the National Maximum Speed ​​Law in 1974. The state maximum speed limit increased from 55 mph (89 km/h) to 65 mph (105 km/h) on October 1, 1998, making Connecticut the last country in the continent of the United States to raise the speed limit above 55 mph (89 km/h).

The speed limit for all roads in Connecticut - including local roads - is set by the State Traffic Commission, a body composed of members of the Department of Motor Vehicles (CTDMV), the Ministry of Emergency and Public Protection (DESPP), and the Department of Transportation (CONNDOT).

The State Traffic Commission usually sets a speed limit following the engineering studies undertaken by CONNDOT. Data used in setting speed limits include traffic volume vs. highway capacity, design speed, road geometry, junction distance and/or interchanges, the number of driveways and cutting of the sidewalk, and the level of accidents.

Cities are usually asked to seek approval from the State Traffic Commission for changes at speed limits posted on locally owned streets after proper engineering studies are undertaken.

Fines are rapidly duplicated in school zones when children are present, and construction areas when workers are present.

Prior to the introduction of the National Speed ​​Limit Act in 1974, Connecticut allowed a maximum speed limit of 60 mph (97 km/h) on rural highways.

On March 26, 2018 the contractor began installing a new speed limit mark on the I-84 between the Waterbury/Cheshire line and the junction with CT Route 9, increasing the speed limit to 65 mph. This follows a DOT study that shows the 85th percentile speed of free flowing traffic in this segment averaging 77 mph.

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Delaware

In Delaware, three roads carry a speed limit of 65 mph (105 km/h): Interstate 495, part of the Delaware Route 1 toll road, and Interstate 95 from the Maryland line to the southern intersection with I-495. The rest of Interstate 95 between the southern intersection with I-495 and the Pennsylvania line and the Delaware Route 141 freeway section is 55 mph (89 km/h) while the I-295 is 50 mph (80 km/h). Prior to the nationally accepted National Maximum Speed ​​Act, the I-95 typically has a speed limit of 60 mph (97 m/h) except around Wilmington. In May 2015, the state of Delaware increased the speed limit on Interstate 95 from 55 mph (89 km/h) to 65 mph (105 m/h) between the Maryland country line and I-495 interchange. In January 2017, the speed limit on Delaware Route 1 between Trap Shooters Road and Puncheon Run Connector in Dover increased from 55 mph (89 km/h) to 60 mph (97 mph/hr) while the speed limit on Puncheon Run Connector increased from 50 mph (80 km/h) to 60 mph (97 km/h).

All rural two-lane roads have a 50 mph speed limit (80 km/h), while all urban speed limits, regardless of location, are held at 25 mph (40 mph/h) for two-lane roads and up to 35 mph (56 mph/hour) for a four-lane road. Four lane highways such as US 13, US 113, parts of US 40 near Bear and Glasgow, and parts at the DE 1 level are usually 55 mph (89 km/h).

The school zone has a speed limit of 20 mph (32 km/h).

Interstate 495, which forms a shortcut around Wilmington, displays variable speed limit markers for environmental purposes. These marks typically display a speed limit of 65 mph (105 km/h), but this limit changes to 55 mph (89 km/h) on days when air quality is of concern. Limits are also lowered during construction, weather conditions, and when accidents occur.

All neighborhoods and subdivisions in Delaware have a maximum speed limit of 25 mph (40 km/h) as governed by state law. The frequent ad campaigns on state radio stations remind people of this (as of January 2013).

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Florida

Florida has a maximum speed limit of 70 mph (110 km/h), found on the highway, including the rural Interstate highway, several urban highways including I-4 in Lakeland, I-75 in Tampa and Miami (where I-75 ends ), I-95 near Daytona Beach and from the Military Trail to Florida State Route 706 in Palm Beach County, part of the Orlando Toll Roads area such as SR 417 and SR 429, Florida's Turnpike via Port St. Lucie and Orlando, I-10 close to Tallahassee , and most of the rural limited access roads like Suncoast Parkway and Beachline Expressway and rural parts of Florida's Turnpike. 65 mph (105 km/h) is typical on rural 4-lane highways (such as US-19 north St. Petersburg, among other US highways) as well as most other urban highways and toll roads. The rustic two-lane road usually has a 55 mph speed limit (89 km/h) (the standard limit for those roads), although FDOT is allowed to send 60 mph (97 km/h) on the appropriate highway. This is usually done on very rural country roads (such as SR 471) and US Roads (such as US 98 throughout most of the departing states).

Florida usually does not post night speed limits, but there are some exceptions. For the most part, this reduced nighttime speed lies in preserved wildlife for endangered species such as Florida panther and deer. Most of the Tamiami Trail via the Big Cypress National Preserve has a night speed limit of 45 mph (72 km/h). On some streets where speed limits are reduced at night, daytime speed limit signs are not reflective, so at night, only the nightly limit is visible.

The minimum Florida speed limit on Interstate Highways is 50 mph (80 km/h) in the 70 mph zone. At 55 mph, and 65 mph inter-state urban zone, the minimum is 40 mph (64 km/h). At one time, this minimum speed required marking, but these limits have since been codified in state law; signs indicating this minimum speed still exists, but now only serve as a reminder. An urban freeway with a 50 mph speed limit usually does not have a minimum speed limit, as in I-375 at St. Petersburg. In addition, the new Gandy Freeway in St. Petersburg has a speed limit as low as 45 mph (72 km/h).

Florida also does not impose lower truck speed limits. Thus, all traffic is allowed to travel at the same speed.

The school zone in Florida usually has a 10-20 mph limit (16-32 km/h). Most of the blinking yellow lights are activated during their valid time as well as the accompanying signs that post these reduced speed limits are effective. All are strictly enforced and carry a higher penalty for offenses.

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Georgia

The Interstate Rural Highway is posted at 70 mph (110 km/h). Until 2014, some Interstates that pass through city or metropolitan areas with populations over fifty thousand are limited to 55-65 mph (89-105 km/h). However, the new law has allowed urban interstates now posted as high as 70 mph, and some have reflected these changes, such as I-95 via Brunswick, I-85 in Gwinnett County, and I-75 in Macon, Valdosta, and Tifton. Most urban interstates, however, still remain at or below 65 mph. I-285 in the Atlanta area has recently increased from 55 mph (89 km/h) to 65 mph (105 km/h) (with Variable speed limits in the north). I-95 and I-16 via Savannah suburbs (limit of 65 mph on I-95 only for the 1.5-mile section around I-16 interchange), I-16 from the crossing with I-75 in central Macon to the east past Exit 2 is at 65 mph, and the I-185 in Columbus remains at 65 mph, while the Downtown Connector and the I-20 section in Atlanta are posted as low as 50 mph (80 km/h). Most non-interstate highways such as the SR 400 and Athens perimeter highways, installed at 55 to 65 mph.

Four arterial and highway lines can be installed as high as 65 mph (105 km/h). However, Dillon's Rule allows off-city districts to guard four-lane GRIP corridors at 55 mph (89 km/h). However, in recent years, US 1 between Augusta and Wrens raised the speed limit to 65 mph. Another rural four-lane highway with 65 mph including parts of US 441 near Irwinton, US 25 between Augusta and Statesboro, SR 88 between Sandersville and Wrens, SR 16 between Griffin and I-75, mostly US 341 between Brunswick and I-75 , and many from US 82 in South Georgia.

Two path state paths by default are posted at 55 mph (89 km/h). Roads maintained in the area will rarely have speed limits above 50 mph (80 m/h) in the middle & amp; Southern Georgia, 45 mph (72 km/h) in northern Georgia. Both in the Atlanta area, the Ronald Reagan Parkway is installed at 50 mph (80 km/h) as the expressway maintained by the county and Sugarloaf Parkway is installed at 55 mph (89 km/h) along the new eastern freeway section.

In the municipality, the speed limit is generally posted at 35 mph (56 km/h) while it is 25-30 mph (40-48 km/h) in the downtown area.

All roads managed by GDOT subject to a speed limit reduction are given further notice with a nameplate that says "REDUCING COLD SPEED". Furthermore, GDOT has a policy of increasing 5-10 mph (8.0-16.1 km/h) but never higher than 10 mph.

Georgia is one of the few countries with an anti-speed trap legislation passed in the late 1990s. Violation speed of less than 15 mph (24 km/h) above the speed limit will not have assessed points. Fines not rated for riders will be less than 10 mph (16 km/h) above the speed limit. In 2009, Georgia introduced the "Super Speeder" law, which added an additional $ 200 penalty for motorists proven to travel 75 mph (121 km/h) or more on two-lane or undivided roads and 85 mph (137 km/h). h) or more on a shared highway.

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Guam

Guam's speed limit is 45 mph (72 km/h), with 35-45 mph (56-72 km/h) in undivided rural areas and 35 mph (56 km/h) in rural areas.

Hawaii

Hawaii was the last country to increase its maximum speed limit after the National Maximum Speed ​​Act was lifted in 1995, and still has the lowest maximum speed limit of any country. In 2002, following public outcry after a controversial trial with speed enforcement using traffic enforcement cameras, the State Department of Transportation raised the speed limit to 60 mph (97 km/h) on Interstate H-1 between Kapolei and Waipahu, and Interstate H-3 between Tetsuo Harano Tunnels and intersection with H-1. All other highways, including Interstate H-2, have a maximum speed limit of 55 mph (89 km/h), with borderline down to 45 mph (72 km/h) in central Honolulu. Other highways generally have a speed limit of 55 mph and in many cases much less. On July 6, 2016, Governor David Ige has signed a bill to allow the Speed ​​Limit on Saddle Road to increase from 55 mph to 60 mph (the limit is increased to 60 mph on the week of 5 February 2017).

Hawaii has a minimum speed along Interstate H-1 which is only 10 mph (16 km/h) below the speed limit. The minimum speed is usually 45 mph (72 km/h) when the speed limit is 55, and 40 mph (64 km/h) when the speed limit is 50.

Idaho

The speed limit on the freeway in Idaho is generally 80 mph (130 km/h) in rural areas and 65 mph (105 km/h) in urban areas. Trucks are limited to 70 mph (110 km/h). In general, both single and multi-lane rural roads have a limit of 70 mph (110 km/h). Roads with traffic lights are installed at 60 mph (97 km/h) or lower. The school zone speed limit in Idaho is 20 mph (32 km/h).

Senator Idaho, Bart Davis, took SB 1284a to the House of Representatives for discussion in early 2014. The bill passed the Senate on 25 February and was signed into law by Governor Butch Otter on March 18, 2014, which will increase the speed limit on the rural Interstate to 80 mph (130 km/h) on July 1, 2014, on the same date Wyoming raised its speed limit. However, days before the law was enacted, the law was postponed to allow for a more thorough review of the effects of an increased speed limit. The vote on July 14, 2014 approved an increase of 80 mph on a limited portion of the interstate in southern Idaho. The study will begin for other areas later in the summer. The bill will also raise the speed limit of trucks and two lane roads to 70 mph (110 km/h). On July 24, 2014, new signs of 80 mph rise in the Idaho Interstate countryside.

On March 22, 2017, the speed limit on four lines, the split range of US 20 between Idaho Falls and Ashton was raised from 65 mph (105 km/h) to 70 mph.

Illinois

Interstate Highways in Illinois are usually posted with minimum and maximum speed limits, except in some urban areas, especially Chicago. The standard speed limit is 70 mph for rural highways, minimum speed limits 45 mph, 65 mph for 4 shared lanes, and 55 mph for all other highways. Urban freeways/speed limits between countries can range from as low as 45 mph in downtown Chicago, where all the major interstates join, up to 65 mph off the Chicago metro and the St. Louis metro area. Louis East, and in some small towns. Some interstates in small towns (eg I-55/74 via Bloomington-Normal, I-39/90 via Rockford, I-57 & I-74 through Champaign-Urbana) do not have a reduced speed limit, and the I-355 stretch between I-55 and I-80 in the southwestern suburb of Chicago was signed at 70 mph. Most of the highways and interstates are in Cook, DuPage, and Lake Counties, and some interstate sections and highways in Will County maintain a speed limit of 55-60 mph. Due to the high population density, the only highway in Cook County that exceeds the 60 mph speed limit is I-57 at the southern end of the county, part of the I-80 between Central Ave and Harlem Ave, and the southern segment of I-355, which past Cook County briefly before crossing into Will County to the north and south. Until January 2010, reduced speed limits installed in the construction zone must be adhered to 24 hours a day, regardless of whether the worker is present or not.

On February 10, 2017, the bill was introduced to raise the speed limit on interstate highways and narrow roadways up to 75 mph. The bill also contains provisions to increase the maximum speed limit of up to 60 mph for all rural roads, roads and roads that do not have 4 or more lanes of traffic. On May 27, 2017, at I-90 (Jane Addams Tollway), the 55 mph fixed speed limit to Elgin to the west of Randall Road. The I-290 is installed at a speed of 60 mph for several miles in Schaumburg from I-90 to the new IL-390 Tollway.

Indiana

In Indiana, the speed limit on Interstate Highways is usually 70 mph (113 km/h) for cars and 65 mph (105 km/h) for trucks with gross vehicle weight (GVW) of 26,000 pounds (12,000 kg) or larger. In urban areas, it is generally 55 mph (89 km/h), except the Interstate 70 stretch in Indianapolis where it is 50 mph (80 km/h). In the suburbs, it is 65 mph (105 km/h) for cars and 60 mph (97 km/h) for trucks.

Most non-Interstate highways are 55 mph (89 km/h), but some four-lane highways are split into 60 mph (97 km/h). This limit often decreases to 30-50 mph (48-80 km/h) approaching urban areas, and within the city the speed limit of 20-30 mph (32-48 km/h) is not uncommon, although the larger arterial roads inside the city can reach as high as 45 mph (72 km/h). On February 6, 2012, Indiana's highway was raised from the Illinois state line to 20 to 70 mph (113 km/h) marker miles after the major road reconstruction project.

Iowa

In Iowa, most highways have a speed limit of 55 mph (90 km/h). The Interstate Rural Highway has a limit of 70 mph (115 km/h) and a minimum of 40 mph (65 km/h). Urban interstate limits generally range from 55-65 mph (90-105 km/h), but may be lower in the area. Interstate 74 Bridge from Bettendorf to Moline, Illinois, for example, has a limit of 50 mph (80 km/h) because the bridge is narrow and has no shoulders. A four-lane road may have a 65 mph limit (105 km/h). If a road is built to a highway standard, such as US $ 20 between I-35 and Dubuque, it may have a minimum speed limit, but otherwise the four-lane road does not carry a minimum threshold so that slow-moving agricultural vehicles can use the highway.

On February 21, 2017, the bill was introduced to raise the speed limit from 70 mph to 75 mph on interstate highways.

Kansas

Once the National Maximum Speed ​​Limit is lifted, Kansas raises the interstate speed limit generally to 70 mph (110 km/h); a study found "no statistically significant increase in accidents, fatal accidents and mortality rates were recorded during subsequent periods on the interstate highway network in rural or urban areas On the other hand, statistically significant increases in accidents, fatal accidents and the observed mortality rate on a 2-lane rural highway network. " In 2011, Governor Sam Brownback signed a law raising Kansas's top speed limit to 75 mph (121 km/h) on Rural Interstate and limited access to US Routes, effective July 1, 2011. Kansas Transport Department announced on June 21, 2011, that 807 miles of highway, consisting of rural I-70, I-35, I-135, Kansas Turnpike and road repair parts from US-69 and US-81, will be raised to 75 mph. Other four-way, non-limited access, divided roads have a speed limit of 70 mph, with 65 mph on two undivided paths, and 55 mph on municipal roads. Before the National Maximum Speed ​​Limit, the Kansas Turnpike speed limit was used to be 80 mph (130 km/h), but was reduced to 75 mph on August 17, 1970. The minimum speed limit at Kansas Interstate is 40 mph.

Kentucky

Kentucky generally has a 70 mph speed limit on rural highways in 2007. The speed limit decreased to 55 on multi-lane highways in some urban areas (I-71/75 south of Cincinnati, I-64, I-65, I-71 and I-264 in Louisville, US 60 bypass in Owensboro), and KY 4 in Lexington. There are two 50 mph regions in Louisville. One that approached the Minton Sherman Bridge crossed the Ohio River to Indiana on I-64, and another approached Kennedy Bridge on I-65 to Indiana. The Transport Cabinet is now authorized to raise multilapis toll roads split into 65 MPH based on speed and design studies. Anyone can request an increase by contacting their local Transport Cabinet office and determining the path to be raised. Two-lane highway, not limited to 55 MPH. Points are not rated for speeds of less than 10 mph during speed limits only on restricted access highways, or for tickets received by licensed Kentucky drivers out of state.

Louisiana

Louisiana's top speed limit is 75 mph, found on 154 miles of Interstate 49 in Saint Landry, Avoyelles, Evangeline, Rapides, Natchitoches, DeSoto and Caddo parishes. Zone 75 was established by the Department of Transport and Development of Louisiana in 2011 after the official DOTD 2010 legislation to implement 75 zones where proven safe.

70 mph posted on Interstate 10, 12, 20, 49, 55, 59, 220, and 310.

The 60 mph speed limit is posted on I-10 at Lake Charles, Baton Rouge, and from LaPlace to New Orleans, I-12 in Baton Rouge, I-20 in Shreveport and Monroe, I-49 in Alexandria and Shreveport, I-310 at Destrehan, I-220 in Shreveport, US Routes 71 and 167 in Kingsville, LA 3132, and Interstates 110, 210, 510, 610, and 910 (note: parts of I-10 in Baton Rouge are raised to 70 mph, I-12 in Baton Rouge was also raised to 65 mph).

Most two-lane highways in Louisiana have a maximum speed limit of 55 mph.

In August 2003, Governor Mike Foster announced speed and lane restrictions on trucks on a stretch of Interstate 10 (29 km) as far as 29 kilometers known as the Atchafalaya Swamp Freeway. Restrictions lower the truck's speed limit to 55 mph and limit them to the right lane for the entire length of the elevated toll road.

Other laws

There are exceptions to road law and basic speed

The divided highway in the countryside has a speed limit of 65 mph. Louisiana R.S. Law 32:61 (B) & amp; 32:62 (A) states;

65 mph on other multi-lane highways that have partial or no access control.

Louisiana operates under a reasonable and wise basic law;

No one will drive a vehicle at greater speed than is reasonable and wise under the conditions and potential dangers that exist, taking into account the traffic on, and the surface and width of the highway, and weather conditions. R.S. 32:64 (A)

Someone, who operates a motor vehicle on a multilane highway at a speed less than normal traffic, has to drive on the right lane and can then be used for traffic. R.S. 32:71 (B) (1)

Maine

Maine carries the highest speed limit on the East Coast, with Interstate 95 carrying a 75 mph limit between the Old City and Houlton. Sections I-95 south of the Old City as well as 295 carry a 70 mph limit, except for short 50-65 zones in more populated areas (NOTE: the speed limit on I-295 was recently restored to 65 mph between Falmouth and Topsham as 27 March 2017). The Saco I-195 stub is 60 mph, and I-395 is 60 mph in Bangor and 65 mph in Brewer.

Standard speed limits in Maine are:

• 20 mph in the school zone within 30 minutes of the start or end of school day, or during breaks
• 20 mph near the junction "when the operator's view is blocked", unless the right-of-way is given through the sign
• 25 mph in a business or residential area, or other default area
• 45 mph on the other way

In Maine, school buses may not exceed 45 mph on the road with higher speed limits when transporting students. At other times, the limit is 55 mph, except on the Interstate Expressway, in which case the posted limit applies.

Also the speed limit on the county road is 30 MPH Fines for speeding at least $ 50 by law. Exceeding the speed limit of up to 30 mph or more is considered a crime.

Maryland

The speed limit on Interstate Highways Maryland is posted by default at 65 mph although the 70 mph limit can be posted after traffic and engineering studies. Effective October 1, 2015 the speed limit on I-68 is 70 mph except for the seven mile section around Cumberland. Effective April 4, 2016, the speed limit on I-70 has been increased to 70 mph from the Pennsylvania state line to MD 180 in Frederick County and from MD 144 in Frederick County to US 29 in Howard County. Maryland urban highways typically have a speed limit of 55 mph (like I-495) or 60 mph, although some stretches are signed for a 65 mph ride such as parts I-95 and I-97 in and around the Baltimore suburbs I-70 around Frederick , and I-81 around Hagerstown. I-70 around Hagerstown posted at 70 mph. A tighter boundary was found on I-83 south of North Avenue when approaching downtown Baltimore and on I-68 via Cumberland, both sections were marked at 40 mph.

Four non-interstate and non-freeways lanes are posted at 55 mph. These include highway expressways such as US 50 and US 301 east of Bay Bridge, US 15 north Frederick to the Pennsylvania state line, MD 404 around Denton and US 29 between I-495 and I-70.

Typically, the speed limit decreases in 5 mph to 10 mph increments. However, one speed zone falls from 55 to 25 mph along the US 301 to the south at the Nice Bridge to the toll plaza.

Two lane roads are generally installed at 50 mph but there are several routes posted at 55 mph. It is more common to see 55 mph on the Eastern Shore and in Frederick and Carroll County than the Baltimore-Washington and Western Maryland corridors. Two lane routes that have a speed limit of 55 mph impose the use of compulsory lamps.

Urban and city center speed limits are generally posted at 30 mph.

Massachusetts

As determined by Massachusetts law, the default speed limit is as follows:

• 20 mph (32 km/h) in the area of ​​the vehicle (eg, ice cream truck) selling merchandise and showing yellow lights flashing
• 20 mph (32 km/h) in the school zone when children are present
• 30 mph (48 km/h) on the road in the "settled" district or business district at least ¹ / ₈ 200 m)
• 40 mph (64 km/h) on the road outside of the "crowded" or business district at least / ₄ )
• 50 mph (80 km/h) on highways split outside "business district" or business district at least for ¹ / ₄ mi (400 m)

State highways and other arteries are often installed at 35 to 40 mph (56-64 km/h) in urban areas and 45 to 50 mph (72-80 km/h) in rural areas. A number of undivided roads are installed at 55 mph (89 km/h). Split roads are usually installed at speeds of 45 to 55 mph (72-89 km/h) in rural areas as well as business districts. Interstate interstate and several non-Interstate access control roads in suburban and rural areas are installed at 65 mph (105 km/h), but many non-Interstate highways are installed at 55 mph (89 km/h), such as freeway parts US 3, US 6, Route 2, and Routes 128, or 60 mph (97 km/h), such as Massachusetts Route 3 South of Boston. Urban freeways are often installed at speeds of 55 mph (89 km/h) and sometimes lower, but some rural highways passing through urban areas maintain speed limits of 65 mph (105 km/h), such as the Massachusetts Turnpike via Springfield and Worcester area.

A "thick settled district" is an area where residential and commercial building structures are less than 200 feet (61 m) apart for a distance of 1 mile (1.6 km) or more. This can be subjective since most of eastern Massachusetts are built with many different jurisdictions and different speed limits are set.

Michigan

The maximum speed limit in Michigan is 75 mph (121 km/h). Michigan uses the formula based on the number of driveways and streets, or at the 85th percentile of free-flowing traffic, and if no method applies the standard 55 mph (89 km/h). In rural areas, the speed limit is as follows:

• The freeway speed for passenger vehicles ranges from 70 mph (110 km/h) to 75 mph (121 km/h).
• The speed of the highway for trucks and military vehicles is 65 mph (105 km/h).
• Non-highway speeds for passenger and truck vehicles range from 55 mph (89 km/h) to 65 mph (105 km/h).

Motorways in Michigan are usually signed at minimum and maximum speeds. By default, the freeway speed limit is 70 mph (110 km/h), with a minimum speed of 55 mph (89 km/h) for all vehicles, although the 65 mph truck speed limit (105 km/h) - effectively enables the truck has only a legal speed of 10 mph (16 km/h). The Mackinac Bridge, due to substandard design, has a speed limit of 45 mph (72 km/h) for passenger vehicles and 20 mph (32 km/h) for trucks. The Michigan Department of Transportation and the Michigan State Police may raise the speed limit to 75 mph (121 km/h) after it is considered safe to do so. MDOT and MSP announced on 26 April 2017 that the speed limit was raised to 75 mph in some Michigan freeways, including I-75 from Bay City to Sault Ste. Marie (excluding Mackinac Bridge), I-69 from Business Loop 69 in Clinton County to I-94 at St. Clair County (excluding sections in and around Flint, which remain at 70 mph (110 km/h)), US 127 from I-69 in Clinton County to I-75 in Crawford County (excluding a 15-mile stretch between St. Johns and Ithaca, which is not a highway standard), and US 131 from M-57 in Kent County until the end of the highway to the north of Manton. This increase begins on May 1, 2017 and finishes on May 15, 2017. Speed ​​limits in free road work zones are limited to 60 mph (97 mph/h) 24 hours per day. If the worker is present (and not behind the barrier), the driver should slow down to 45 mph (72 km/h) for the safety of the worker.

The Michigan speed limit on the urban Interstate is usually higher than that of its neighbors. For example, in the Detroit metro area, I-75 south enters Detroit on M-102 (8 Mile Road, exit 59) and retains the 70 mph (110 km/j) boundary all the way to the junction with I-94 (exit 53), at where the speed limit drops to 55 mph (89 km/h). Other freeways in Detroit such as I-94 and I-96 also have a speed limit of 55 mph (89 km/h) in and around the downtown area, but up to 70 mph (110 km/h) relatively soon after leaving City center. area. At Grand Rapids City Center, I-196 has a speed limit of 65 mph (105 km/h), the only other urban Interstate highway that has a reduced speed limit. US 131 in Grand Rapids is one of the non-interstate urban highways in Michigan with a speed limit of 70 miles per hour (110 km/h), which is raised from 55 miles per hour (89 km/h) since 2013. Furthermore, speed limits in smaller cities, such as Kalamazoo, Ann Arbor, and Lansing (state capitals) remain at 70 mph (110 km/h).

The standard speed on all other highways, whether two or four lanes, is 55 mph (89 km/h). However, Michigan allows speed limits of up to 65 mph (105 km/h) after safety studies conclude higher limits are safe to apply. Until 2016, this provision applies only to highways without a divided 4-lane road. A 20-mile (32 km) stretch of US $ 127 between St Johns and Ithaca has been posted at 65 mph (105 km/h), as a compromise to allow more free flow of traffic because the funds are insufficient to increase the passage to a standard highway. The speed limit in US 2 between Rapid River and Gladstone on the Upper Peninsula also increased to 65 mph (105 km/h). In the summer of 2017, speed limits begin to increase up to 65 mph on some two-lane roads in Lower Peninsulas and Upper Michigan, including US 2 from St. Ignace to Rapid River and M-28 from I-75 to Munising.

Midway Atoll

The speed limit at Midway Atoll is 15 mph (24 km/h).

Minnesota

The 70 mph speed limit is only allowed on Interstate Minnesota outside of urban areas. The 55 mph speed limit is usually used in urban areas where higher speed limits may be used, but traffic congestion or other reasons require lower speed limits. Examples include I-94, I-35W and I-35E in and around Minneapolis, Moorhead and Saint Paul. 35E down to a speed limit of 45 mph in some areas of Saint Paul. The 60 mph speed limit is commonly used in suburban areas such as the I-494 and I-694 loops in the Twin Cities metro area.

Contiguous non-interstate highways (both highway and highway) have a speed limit of 65 mph in rural areas and up to 60 mph in urban or suburban areas (NOTE: some non-separated highways have been upgraded speed limits in November 2017 such as US Route 169 in the Twin Cities Metropolitan area). State and US country roads in Minnesota have a standard speed limit of 55 mph although some 60 mph speed limits have been posted after traffic and engineering studies that will continue until 2019. The provincial road has speed limits of up to 55 mph for 2 lines and 60 parts divided.

Mississippi

The 70 mph speed limit is only permitted on the Mississippi rural freeway; only Interstate (except I-110), US Highway 78, Mississippi Highway 304, and part of US Highway 82 which has a speed limit of 70 mph, with this length reaching about 86% of the state highway mileage.

Batas kecepatan 65 mph biasanya digunakan di jalan raya empat jalur yang terbagi negara bagian, yang termasuk bagian dari jalan raya berikut:

• AS Rute 45/A.S. Rute 45 Alternatif
• AS Rute 49/A.S. Rute 49W
• AS Rute 61
• AS Rute 72
• AS Rute 82
• AS Rute 84
• AS Rute 90
• AS Rute 98
• AS Rute 278
• MS 15
• MS 19
• MS 25
• MS 39
• MS 57
• MS 63
• MS 67
• MS 302
• MS 605
• MS 607

The 60 mph speed limit is usually used in urban areas where higher speed limits may be used, but traffic or geometric conditions are lower speed limits, including the following areas:

• Interstate 20 in Vicksburg, from Jackson to Pearl, and Meridian
• Interstate 55 from Jackson to Ridgeland
• Interstate 59 at Laurel and Meridian
• US. Route 61 at Tunica Resorts
• US. Route 78 in New Albany
• US. Route 82 in Columbus

House Bill 3, ratified at the first Extraordinary Session of 2008 state legislature, allows speed limits of up to 80 mph (130 km/h) on toll roads in the state; However, in 2016, there is no such path.

Mississippi has a minimum speed of 30 mph on a four-lane US highway when there is no danger. Surprisingly, there is no law for the minimum speed of the country's four-lane state roadway that continues to grow. The minimum is 40 mph on Interstate Highways and on four lanes of a US highway that has a speed limit of 70 mph. In 2004, Mississippi installed a minimum speed limit (40 mph) on all rural Interstate, but this minimum speed limit had become the state law before that.

Missouri

The speed limit according to the laws of Missouri is as follows:

• Highway interstate and highway in the countryside: 70 mph
• Freeway in rural areas: 65 mph (notable exception is US 54 & US 63 Expressways north of Jefferson City, which is an in-class highway with a speed limit of 70 mph)
• Interstates, freeways, and expressways in urban areas: 60 mph
• Rustic highways with other country numbers: 60 mph
• State highway highway: 55 mph

The highway is defined as: "a limited access road divided by a length of at least ten miles by four or more lines that are not part of a federal interstate highway system that has no intersections or access from other roads, highways or highways at the grade level just like a highway split within ten miles of a divided highway. "

The expressway is defined as: "a divided highway at least ten miles with four or more lanes that are not part of a federal interstate highway system that has intersections or access from roads, highways or other highways on the same grade level with a divided highway like that. "

Urban Areas are defined as: "an area with a population of fifty thousand at density at or more than a thousand people per square mile".

Highways and transport commissions can raise or lower the speed limit on this highway, but no speed limit can be set above 70 mph on the numbered highway and 60 mph on the highway letters.

Interstate highways have a minimum speed limit of 40 mph. There has been talk of 75 mph imposed on the Interstate highway, but laws allowing law have not been enacted.

Variable speed limit

Missouri ended a two-year experiment with variable speed limits along I-270 around St. Louis. Louis. Digital signs have been installed along the freeway as well as additional signs that remind drivers about the use of variable speed limits. Limits will vary between 40 and 60 miles per hour, depending on traffic conditions, and can change up to 5 mph every 5 minutes. This speed limit, as of January 2012, is now posted as "Speed ​​Limit Advisor".

During major closure and redevelopment of I-64 in St. Petersburg. Louis, an additional line was added to I-44 and I-70, and the speed limit was reduced to 55 mph on the streets of St. Louis. Louis County and City.. Construction I-64 has been completed, and additional lines were removed in 2010. In October 2010, the speed limit was restored to 60 mph on both I-44 and I-70.

Exceptions to legal limits

Most two-lane roads with shoulders have a 60 mph speed limit in Missouri. A two-lane road without shoulders is usually, but not always, limited to 55 mph. However, the following two-lane highway has a speed limit of 65 mph when it passes through or outside of the entered area.

• AS-54 from El Dorado Springs west to the state line of Kansas; from the southwest MO-73 intersection of Macks Creek to the west of the Niangua River Bridge; and also along the Mexican shortcut.
• US-63 from southern Vienna to Thayer, near the Arkansas state border. Some of these routes have three lanes, with lanes passing between the north and south traffic.
• MO-5 between Camdenton and Lebanon. This road has three lanes, with lanes passing between the north and south traffic.
• MO-43 from US-54 south to Joplin
• MO-96 from I-44 west to Carthage

Most rural highways have a speed limit of 65 mph, but the following have a speed limit of 70 mph.

• AS-54 from the southern tip of Mexico's shortcut to the Route W intersection just across the Missouri River from Jefferson City, with the exception of the I-70 exchange area in Kingdom City, which is 45 mph. The US-54 also has a speed limit of 70 mph from Fall Hill Road in Cole County to the north of the Business Route 54 intersection at Lake Ozark.
• The US-63 from the southern end of Kirksville cuts into the US-54 north of Jefferson City, with the exception of passage through Columbia from Route B to AC Route, which is 65 mph.
• MO-7 from I-49 to west of Clinton.
• The US-71 expressway from Carthage to Harrisonville has a 70-mph limit before being upgraded to I-49.

Most major Missouri highways are 55 mph, and in densely populated areas they can be less. There are some that have a speed limit of 60 mph, though.

• Route M in Jefferson County is a highway for most of its length, and most highways have a speed limit of 60 mph.
• Route A in Jefferson County, a two-lane road upgraded with shoulders, has a speed limit of 60 mph. Route A travels between Hillsboro and Festus.
• Route B in Boone County is largely a two-lane road that is upgraded with shoulders. As such, it has a speed limit of 60 mph from northern Columbia to the end of an enhanced section 1 mile south of Hallsville.
• Route B in Cole County is a four-lane highway from US 54 to Lorenzo Greene Dr. in Jefferson City, and is a two-lane highway upgraded with shoulders for the rest of the way south to Wardsville. Both sections have a speed limit of 60 mph.
• Route C in Cole County is a two-lane highway that is enhanced with shoulders, and has a speed limit of 60 mph from west Jefferson City to east Russellville.
• Route A in Osage County follows the first Route 50 US route from its intersection with US 50 to the modern Long Creek. Since the road is designed to the same standard as the main highway, the speed limit is 60 on the stretch of road.

In urban areas: St. Louis, Kansas City, Columbia, St. Louis Joseph, and Springfield, the speed limit usually drops to 60 mph on the Interstate and the highway. In addition, at I-44 at Rolla the speed limit is reduced to 60 mph from the west of Exit 184 to Exit 186 due to sub-standard design.

Freeway speed limits in urban areas can be as low as 45 or 50 mph in some very short sections in downtown Kansas City and St. Louis. Louis, or as high as 65 mph on the outside of St. Louis, Kansas City and St. The area of ​​Joseph. The Cape Girardeau and Joplin areas do not have freeway speed limits, and I-435 around Kansas City has a 70 mph limit from I-35 in Claycomo to the Kansas State Line around the north and west of the metro area.

I-29 in Kansas City has a 70 mph limit north of Barry Road in Platte County to south Highway 169 in Buchanan County where the limit drops to 65 mph. North Frederick Road at Buchanan County limits back to 70 mph up the Iowa country line.

Montana

On October 1, 2015, the maximum speed limit in Montana is 80 mph. On May 5, 2015, a bill to increase the speed limit of Montana's rural highway to 80 mph was signed into law by Governor Steve Bullock.

Reasonable and thoughtful

In the years before the 55-mph national limit of 1974, and for three years after 1995's removal of the rising 65-mph limit, Montana had a "non-numerical" sense of "wise and reasonable" speed limit during the day on most rural roads. Montana Code Annotated (MCA) Section 61-8-303 says "Someone... will drive a vehicle... at a speed no greater than a reasonable and precise under the conditions at the point of operation... in order not to be too or it does not make sense to endanger life, limbs, property, or any other rights of any person entitled to the use of roads or highways. "

The law of Montana also establishes some numerical limits: the night speed limit, usually 55 or 65 mph (89-105 km/h), depending on the type of road; 25 mph (40 km/h) in urban areas and 35 mph (56 m/h) in the construction zone.

The phrase "reasonable and prudent" is found in the language of most state speed laws. This allows prosecution under conditions that are not ideal such as rain or snow when speed limits will quickly make no sense.

No speed limit

On March 10, 1996, a Montana patrol issued a ticket that drove to a driver traveling at 85 mph (136 km/h) on a stretch of State Highway 200. The 50-year-old driver (Rudy Stanko) operated the Chevrolet in 1996. The Camaro with less than 10,000 miles (16,093 km) on the odometer. Although the officer did not give an opinion on what would be a reasonable speed, the driver was found guilty. The driver appeals to the Supreme Court of Montana. The court overturned the verdict in the case No. 97-486 on December 23, 1998; he argues that the law requiring drivers to drive at "non-numerical" reasonable and reasonable speeds is very unclear in order to violate the Clause of the Process... of the Montana Constitution. "

Effective May 28, 1999, as a result of that decision, the Montana Legislature set a speed limit of 75 mph.

• The US, Montana, and Montana Secondary Roads have a 70 mph/night speed limit: 65; truck: 60/night: 55.

Seven years later, a study conducted by the Insurance Institute for Highway Safety, a long-term advocate of the federal National Maximum Speed ​​Act, shows a 75 mph Montana speed limit on the rural Interstate well received by motorists; the measurement of the speed of traffic taken by IIHS shows 76 percent of the cars corresponding to 75 mph on those roads. IIHS also found large trucks subject to the 65 mph Montana speed limit for large trucks on the rural Interstate slowed dramatically, from an average speed of 70 mph in 1996 to 65 mph in 2006, with 85 percent the speed of large trucks down 11 mph, from 79 mph in 1996 to 68 mph in 2006.

75 and 80 mph speed limit

Despite this reversal, Montana's governor, Marc Racicot, did not hold a legislative emergency session. Montana technically had no speed limit until June 1999, after Montana's parliament met in a regular session and enacted the law

Source of the article : Wikipedia