The follow states have a rural interstate speed limit of 60 mph, unless otherwise marked: The follow states have a rural interstate speed limit of 65 mph, unless otherwise marked: The follow states have a rural interstate speed limit of 70 mph, unless otherwise marked: The follow states have a rural interstate speed limit of 75 mph, unless otherwise marked: The follow states have a rural interstate speed limit of 80 mph, unless otherwise marked: Spring Cleaning Tips: Maintain your vehicles resale value by keeping it in peak shape. Colorado Pennsylvania has no default minimum speed limit on any other roads. The driver may claim a case of mistaken identity. The standard speed limit in Vermont stands at 50mph (80km/h). The only way to be able to increase this is to reprogram the computer. The amendments made to section 11 of this chapter by P.L.40-2007 apply to civil judgments entered for infractions committed after June 30, 2007. Section 32:61 - Maximum speed limit A. A driver may claim that an emergency situation caused the driver to break the speed limit in order to prevent injury or damage to themselves or others. C.(1) Any low-speed vehicle operated upon any divided highway, highway, roadway, or street shall be registered with the state of Louisiana, office of motor vehicles, in the same manner as motor vehicles intended for personal use; such low-speed vehicles shall be issued a license plate and shall be required to pay an annual registration license . The standard speed limit is 70 mph for rural freeways, a 45 mph minimum speed limit, 65 mph for other 4 lane divided highways, and 55 mph for all other highways. (Photo taken 12/9/20). In addition, on I-44 in Rolla the speed limit is reduced to 60mph from just west of Exit 184 to Exit 186 because of a substandard design. In February 2014, the state Assembly passed a bill that would raise the speed limit from 75 to 80mph (121 to 129km/h) on certain freeway segments that would meet safety standards. They usually indicate, but not always, statutory speed limits. Heres an example. Speed limits on any interstate or controlled access facility on the State Highway System may be raised by NCDOT from the statutory limit, to a maximum of 70 MPH . eegyvudluk pootoogook / stacey and dave forsey net worth / minimum speed limit on interstate in louisiana. Made with in Silicon Valley. [Note 3] NTTA was allowed to raise the speed limits by offsetting the higher limits' theoretical emissions increases with other transportation-related emissions reduction measures, including implementation of all-electronic tolling, which eliminated the need for some vehicles to stop at a toll booth. The speed limit in the Northern Mariana Islands is 45mph (72km/h).[139]. Speed limits on 4-lane divided highways are normally 65mph (105km/h), although some stretches within cities are posted as low as 50mph (80km/h). Speed limits are typically posted in increments of five miles per hour (8km/h). Some interstates in small cities (e.g. Route A travels between, Route B in Boone County is mostly an upgraded two lane road with shoulders. California Towing speed limit: 55 mph Did you know? With a maximum of that type you definitely need some type of minimum speed. This replaced most 'when children are present' placards. The change went into effect on July 1, 2014. Please note that Hawaii speed limits vary between islands. It is not uncommon that 55mph can be expected in more built-up areas prior to municipalities and/or if the engineering on the highway is below standards. Speed limits are statutory (set by law) or regulatory (enacted by regulation), not necessarily by engineering standards. Two-lane, undivided highways are limited to 55mph. When the National Maximum Speed Law was enacted, California was forced to create a new legal signage category, "Maximum Speed", to indicate to drivers that the Basic Speed Law did not apply for speeds over the federally mandated speed cap; rather, it would be a violation to exceed the fixed maximum speed indicated on the sign, regardless of whether the driver's speed could be considered "reasonable and prudent". Tennessee statutes require rural interstates to be posted at exactly 70mph (113km/h) unless a traffic study is performed indicating that such a speed is unsafe. As of 2014, ODOT has replaced nearly all SPEED signs posted on Interstates with SPEED LIMIT signs, but it was left to the various city governments to replace signs in their jurisdictions at their leisure, if at all. Department Of Public Safety; Highway Patrol; Speed Limits Speed Limits Speed Limit: Roads/Vehicles Affected: 70 MPH: Interstate: 65 MPH: Roadways with four or more lanes: 55 MPH: Other roadways unless otherwise marked: 45 MPH: County roadways unless otherwise marked . M.P.H. However, the only interstates raised to 65mph are Interstate 95 from exits 1-9 and Interstate 295.[166]. ", Expressways are defined as: "a divided highway of at least ten miles in length with four or more lanes which is not part of the federal interstate system of highways which has crossovers or accesses from streets, roads or other highways at the same grade level as such divided highway.". The maximum speed limit found on highways in Ohio is 70 miles per hour (113km/h) on the Ohio Turnpike, Rural Freeways, and both the Expressway and Freeway portions of US 30 from Mansfield, Ohio to the Indiana State Line and US 33 from Wapakoneta to St. Mary's Ohio. These speed limits are generally considered to be grandfathered in, per a policy from NCDOT stating new speed limits below 25mph "will generally not be approved. Local governments are barred from raising the default speed limits during the day and at night. Traffic violations can be a lucrative income source for jurisdictions and insurance companies. Speed studies undertaken by TxDOT in response to legislation passed in 2011 took about 2 years, and the result is that the mileage of highway with a speed limit of 75mph has increased from about 1,400 to about 19,000. Notably, the revised statute does not require a 70-mph speed limit on any road nor make such limit automatic, due to the requirement for traffic and engineering studies. Four lane non-interstates and non-freeways are posted at 55mph. Flat rate pricing based on labor time and parts, Hand-picked, community-rated professionals, Trusted mechanics, rated by thousands of happy car If workers are present (and not behind a barrier wall), drivers must slow to 45mph (72km/h) for the workers' safety. Speed Limits by State 2023 Rural Interstates Speed Limits by State 2023 Show Source * All speeds are in miles per hour. App. All neighborhoods and subdivisions in Delaware have a maximum speed limit of 25mph (40km/h) as set by state law. It is rare that NCDOT will assign a speed drop greater than 20mph. The federal government enforced the national maximum speed limit by withholding federal funding for projects whose speed limits exceeded 55 miles per hour (89km/h). A "State Speed Limit 55" sign should be installed after the curve. In urban areas speed limits vary from 25mph (40km/h) on residential streets and central business districts, 30to 40mph (4864km/h) on arterial roadways, and from 45to 55mph (7289km/h) on urban freeways. The highest posted limit in Utah is currently 80mph. Almost a decade after posting the 75mph limit, average speeds on South Dakotan rural freeways remain at or below the speed limit. Arkansas Towing speed limit: 65 mph Did you know? One road has a posted limit of 45mph/trucks:35 in Escondida, just north of, State Highway 30, a paved two-lane road with shoulders, has a 55mph speed limit from, The posted speed limit on Silver Avenue in. Speed limits in the United States by jurisdiction, Elimination of Dallas-Fort Worth region environmental speed limits, Public opposition to speed limits being set by an authority, often arise because such agency has been viewed as abusing its powersuch as by arbitrary indiscretion or by creating "speed traps". The courtesy wipe feature can help keep your windshield clean after using the windshield washers. Shortly after the December 1995 repeal of the 65/55mph National Maximum Speed Law, South Dakota raised its general rural speed limits to 75mph (121km/h) on freeways and 65mph (105km/h) on other roads along with 70mph (113km/h) on a few 4 lane divided highways. Local roads have lower speeds and more access points, such as intersections and cross streets. Residential streets at the municipal or county level are generally posted at 25mph speed limits in boroughs and cities. There are no longer night speed limits, nor are there any differential speed limits for heavy trucks. There is one interstate posted at 50mph, I-277 in downtown Charlotte. Speed limits are designated by signs and are used in many countries. 335, "Reaugh v. Cudahy Packing Co., 189 Cal. "Area" may be replaced with a term that more precisely defines the area boundaries, such as "Town", "City", "Park", "Village" or "Campus". Before the end of federal speed controls, the maximum speed limit was 65mph on Interstate routes and 55mph elsewhere. The The state of Louisiana offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the past, or are current active military members. In Massachusetts, half of the ticket money goes to the police department that writes the speeding ticket, the other half goes to fund the court that convicts the speeder or collects the fine from them. This action follows a DOT study showing the 85th percentile speed of free flowing traffic on this segment averaged 77mph (124km/h). Mississippi has a minimum speed of 30mph on four-lane U.S. Points are not assessed for speeds less than 10mph over the speed limit only on limited access highways, or for tickets received by Kentucky licensed drivers out of state. School zones in Ohio normally have a 20mph speed limit, regardless of the road's normal speed limit, in effect during school hours. Mighty Mac: How does weather affect the bridge? This is mainly applied on both undivided and divided rural non-freeway routes. The highest speed limit in the country is 85mph (137km/h), which is posted on a single stretch of tollway in exurban areas outside Austin, Texas. Drivers must not exceed the limit that the sign designates. Not only does the burden of proof rest upon the accused, a successful defense may involve expenses well in excess of the cost of a ticket, such as an expert witness. Sept. 1, 1995. 1, eff. [143] [144] Rural sections of freeway or turnpike are supplemented with a sign warning "no tolerance". Due to variations in speedometer calibration, tire size, and margins of error in speed-detecting technology, its uncommon for an officer to pull a driver over for going less than five miles above the speed limit. Violators may be required to attend traffic school, and/or may be able to have their speeding fine reduced by attending these classes. Connecticut was among the last states to raise its maximum speed limit from 55mph (89km/h) originally established by the National Maximum Speed Law in 1974. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Unless otherwise posted: 10 mph in alleys. Most have flashing yellow lights activated during the times they are in effect as well as accompanying signs that post the times these reduced speed limits are effective. [citation needed]. 75. Urban Interstate limits generally range from 55 to 65mph (90 to 105km/h), but may be lower in areas. The State Traffic Commission typically sets speed limits following engineering studies performed by CONNDOT. The The state of Louisiana offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the past, or are current active military members. There is no statutory requirement for reduced speeds on urban freeways so that, for example at Santa Fe and Las Vegas the speed limit remains 75mph on I-25. 75 mph: rural interstate highways, as posted. In roughly a 50-mile (80km) radius of the HoustonGalveston and DallasFt. CHAPTER 5. The state's 4 lane Divided Highways as well as 2 short stretches of undivided 4 lane highways (US 2 around Rugby and U.S. 83 as it passes the eastern Lake Sakakawea Reservoir) usually carry a 70mph limit, with 2 lane restricted to up to a 65mph limit, and gravel roads have up to 55mph limits. Some states and territories have lower truck speed limits applicable to heavy trucks. Freeway speeds for passenger vehicles range from 70mph (113km/h) to 75mph (121km/h). Speed limits for all classes of roads and areas are set by statute in New Mexico, meaning that any changes to the state's speed limits would require a bill to pass both chambers of the Legislature and be signed into law by the Governor (or overridden by the Legislature in the event of a Governor's veto). However, between October 2015 and March 2017, no 80mph speed limits were posted in the state. The 75 zone was established by the Louisiana Department of Transportation and Development in 2011 after a 2010 bill authorized the DOTD to implement 75 zones where proven to be safe.[79][80][81][82]. I-385 has a 55mph speed limit at its terminus within the Greenville area. [89], Upon that repeal, there was effectively no speed limit on Montana's highways for daytime driving (the nighttime limit was set at 65 miles per hour (105km/h)) from 1995 until 1999, when the state Supreme Court threw out the law requiring a "reasonable and prudent" speed as "unconstitutionally vague. A viewer asked, Is there A minimum speed limit on Florida highways?. Speed Limits IC 9-21-5-0.1 Application of certain amendments to chapter Sec. Four-lane divided highways in rural areas are normally posted at the statutory 65mph (105km/h), although some are posted at 55mph (89km/h) and 60mph (97km/h). It is fairly common however that schools serving only higher grade levels will not have a school speed limit in rural areas or where such school sits more than 500 feet (150m) off of the highway or street. In school zones, the speed limit can range from 20mph (32km/h) to 25mph (40km/h), depending on local authority. [162], 3364(a) also requires, "Except when reduced speed is necessary for safe operation or in compliance with law, whenever any person drives a vehicle upon a roadway having width for not more than one lane of traffic in each direction at less than the maximum posted speed and at such a slow speed as to impede the normal and reasonable movement of traffic, the driver shall, at the first opportunity when and where it is reasonable and safe to do so and after giving appropriate signal, drive completely off the roadway and onto the berm or shoulder of the highway. 1, eff. Speed limits in freeway work zones are statutorily limited to 60mph (97km/h) 24 hours per day. Examples include I-94, I-35W and I-35E in and around Minneapolis, Moorhead and Saint Paul. Sept. 1, 1995. [citation needed], Georgia is one of few states with anti-speed trap laws passed in the late 1990s. Public Act 445 of 2016, tasked MDOT and MSP with increasing speed limits on a minimum of 600 miles of limited access freeway to 75 mph, and 900 miles of trunkline highway to 65 mph based on the results of engineering and safety studies that utilize the 85th percentile speeds (the speed at or . It is the driver's responsibility to be aware of the posted speed limit. 32:61(B) & 32:62(A) states; 65 mph on other multi-lane divided highways which have partial or no control of access. . Part of US-70 (as a divided highway) between Las Cruces and Alamogordo is one of only two sections of non-Interstate route as well as being the first road in New Mexico that's not a freeway to have the 75mph limit; as of January 2019, US 285 between Roswell and Vaughn was raised to 75mph as well. (Photo taken 12/9/20). For new construction and reconstruction projects on local roads and streets, the designer should attempt to provide minimum lengths of at least 500 ft. 0.1. A study by the Federal Reserve of St. Louis found that traffic ticket writing increases when government revenue decreases. Provided that no hazard exists that requires lower speed, the speed of any vehicle not in excess of the limit is deemed to be prima facie lawful. Florida typically does not post night speed limits, but there are a few exceptions. [224] As of July 1, 2010, VDOT increased the speed limit to 70mph on a portion of one highway (I-295 south of I-64). The Downtown Connector and portions of I-20 in Atlanta are posted at 60mph (97km/h). You may be able to find an aftermarket computer programmer to add performance to the vehicle and change the speed limit of the vehicle. [61] All other freeways, including Interstate H-2, have a maximum speed limit of 55mph (89km/h), with the limit dropping to 45mph (72km/h) in central Honolulu. [99] In 2004, Mississippi posted minimum speed limits (40mph) on all rural Interstates, but this minimum speed limit was already state law before then. When these routes pass through a residential or heavily-trafficked area, the speed limit will usually drop to 25 mph or below. In Iowa, the majority of highways have a 55mph (90km/h) speed limit. Between 10 and 14 MPH, you pay at least $215. The bill also would raise truck and two-lane highway speed limits to 70mph (113km/h). That just might also trigger a road test imposed by the Dept. Ohio is the only state east of the Mississippi River to allow 70mph speed limits on non freeway roads. [125] New Mexico, Nevada (US 95 south of US 93), and Texas are the only three states with 75mph limits on roads that aren't freeways. "[222] "The maximum speed limit on all other highways shall be 55 miles per hour if the vehicle is a passenger motor vehicle, bus, pickup or panel truck, or a motorcycle, but 45 mph on such highways if the vehicle is a truck, tractor truck, or combination of vehicles designed to transport property, or is a motor vehicle being used to tow a vehicle designed for self-propulsion, or a house trailer. Most of divided highways with traffic lights are posted at 55mph, but there are a few stretches posted at 60mph, such as segments of US 17, NC 11, NC 148, and US 421. California's "Basic Speed Law",[17] part of the California Vehicle Code, defines the maximum speed at which a car may travel as a "reasonable and prudent" speed, given road conditions. [242], Along with the aforementioned default speed limits, there are other statutory speed limits that more often require signs to be effective. 2008 debates over traffic enforcement in Dallas County, Texas, involved concerns of lost profits if ticket writing decreased. As prescribed by Massachusetts law,[87] default speed limits are the following: State highways and other arterials are often posted at 35to 40mph (5664km/h) in urban areas and 45to 50mph (7280km/h) in rural areas. The school zone speed limit in Idaho is 20mph (32km/h). There are two 50mph areas in Louisville. On March 10, 1996,[107] a Montana patrolman issued a speeding ticket to a driver traveling at 85mph (137km/h) on a stretch of State Highway 200. Watch News 6 as they cover breaking local, regional, and national news, plus the latest updates on weather, traffic and sports. Prospect Rd. All other freeways and turnpikes have a maximum of 65mph (105km/h). The driver appealed to the Montana Supreme Court. Previously, the entire US 220 alignment from NC 68 to the Virginia state line was 60mph but went back to 55mph between NC 68 and NC 704. Point system leading to fines, potential license suspension, increased insurance rates, and potential jail time (if criminal). Freeways and expressways with no primary route number are part of the Secondary Road system and bear route numbers of 1000 or greater. Minimum speed limits. [citation needed], Texas is the only state that does not prescribe a different speed limit for each road type in its state or federal highway system. However, the speed limit on the San FranciscoOakland Bay Bridge and in San Francisco is only 50mph (80km/h). [142], On July 28, 2020, the Oklahoma Turnpike Authority approved raising posted speed limits to 80mph on 104 miles of turnpikes:[146]. Only two Secondary Road freeways in the state have a 60mph speed limit: Wade Avenue Extension, which is in Raleigh and unincorporated Wake County; and Aviation Parkway, in the segment running from south of Globe Road to Airport Boulevard, traversing parts of Cary and unincorporated Wake County. [110] Other speed limits in Montana are 1535mph (2456km/h) in a school zone,[111] 30mph (48km/h) in a residential district, 3545mph (5672km/h) on boulevards, 55mph (89km/h) on traffic-light highways, 6570mph (105113km/h) on rural divided 4-lane highways, and 5570mph (89113km/h) on rural 2-lane undivided highways. However, the House defeated the bill, and no efforts have been made to raise them since. The minimum speed on Interstate Highways in New Hampshire is 45mph (72km/h) where posted. The 85 th percentile speed is the speed that 85 percent of drivers travel at or below and is one of the best indicators of a reasonable and safe speed. Freeway: Interstate Highway or other state- or federally numbered road built to Interstate standards. Florida's minimum speed limit on Interstate Highways is 50mph (80km/h) in 70mph zones. Acts 1995, 74th Leg., ch. There is mixed evidence of the 1995 repeal's effect on fatalities. The speed limit drops from 55mph (89km/h) to 25mph (40km/h) at a traffic circle with US 378 and SC 391 in eastern Saluda County. The Cape Girardeau and Joplin areas have no reduced freeway speed limits, and I-435 around Kansas City has a 70mph limit from I-35 in Claycomo to the Kansas State Line around the northern and western part of the metro area. This legislation became active in March 2004, and the speed limit was subsequently raised to 65mph on NY Route 7 (locally known as "Alternate Route 7"), Interstate 684 and Interstate 84 east of the Hudson River in New York. 20 mph: blind curves and narrow mountain highways. Furthermore, most speed-related crashes occur on local and collector roads, which generally have far lower speed limits and prevailing speeds than freeways.[110]. Effective September 1, 1999, Texas repealed truck speed limits on all roads except farm to market and ranch to market roads. [220] The speed limit on every other highway is 55mph unless otherwise posted, although several two-lane, undivided roads have 65mph speed limits, with divided sections of U.S. Route 40 and U.S. Route 189 posted at 65mph as well. A speed limit of 60mph is posted on I-10 in 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-220 in Shreveport, US 71 and US 167 in Kingsville, LA 3132, and I-110, I-210, I-510, I-610, and I-910 (note: part of I-10 in Baton Rouge was raised to 70mph, and part of I-12 in Baton Rouge was also raised to 65mph). [78], Louisiana's highest speed limit is 75mph, found on 154 miles of Interstate 49 in Saint Landry, Avoyelles, Evangeline, Rapides, Natchitoches, DeSoto and Caddo parishes. Point system may lead to license suspension. The bill would have given the DOT permission to raise the speed limit on freeways deemed safe for 75mph travel. [29], Speed limits in California are mandated by statute to be set: (1) at or below the 85th percentile operating speed;[30][31] At one time, these minimum speeds required signage, but these limits have since been codified in state law; signs indicating these minimum speeds still exist, but now simply serve as a reminder. The minimum speed limit on Kansas Interstates is 40mph. Prior to the imposition of the 50 and 55mph (80 and 89km/h) speed limit in late 1973, Nevada also had a "reasonable and proper" speed Limit (non-numeric) on most of its rural highways, both freeway and others. As such, it has a 60mph speed limit from just north of, Route C in Cole County is an upgraded two-lane highway with shoulders, and has a 60mph speed limit from just west of, Route A in Osage County follows the former routing of. Operation and Movement of Vehicles, Code of Criminal Procedure Chapter 45. [233] There are a wide range of speed limits statewide, due to legislated flexibility for WSDOT in balancing the desire for transportation speed against safety considerations for any particular stretch of highway. Most of US 285 (non freeway) between Vaughn and Roswell is posted at 75mph (as of December 2018.). - Minimum speed regulationsGenerally. In 70mph zones, the default minimum speed limit is 55. 70mph speed limits are also relatively common on rural freeways in central North Carolina, but rare in the mountainous western region. This category includes most small backroads and local routes. This rule in substance is a process for voting the speed limit by driving; and in contrast to delegating the speed limit to an engineering expert. Sections of I-95 south of Old Town as well as half of I-295 carry 70mph (113km/h) limits, except for brief 50to 65mph (80105km/h) zones in more populated areas. Driver Responsibility Program, Commonwealth of Virginia, Department of Motor Vehicles, "Moving Violations and Point Assessments", "Chapter 1 - Federal-Aid Highways, Sec. This speed limit only applies to Interstate 80 between Omaha and Lincoln, and west of Lincoln to the Wyoming state line, as well as the small section of Interstate 76 that enters the southwestern corner of the state from Colorado to join I-80. This minimum speed limit posting is normally found on interstate highways, where the maximum speed limit is usually 65 mph or higher and there is also a minimum speed limit posted, say at 40 mph. Most non-Interstate Highways are 55mph (89km/h), but some rural four-lane divided highways are set at 60mph (97km/h). Central business districts (CBDs) are posted at 30mph (48km/h). This speed limit did not apply to buses or to trucks transporting United States Postal Service mail. This limit may be applied outside of "urbanized areas", where speeds of over 85mph (137km/h) on any highway (regardless of the posted speed limit) is considered a criminal (rather than civil) offense. The highest posted speed limit in the country is 85mph (137km/h) and can be found only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic. June 29, 2022. States may also set separate speed limits for trucks and night travel along with minimum speed limits. 386 in Nashville, as well as I-24 in Clarksville[172] and Murfreesboro[173] are posted at 70mph. Speed limit drops generally are done in 10mph increments but 20mph drops are not uncommon. 2d 636", Reaugh v. Cudahy Packing Co., 189 Cal. On other roads, including some that never had environmental speed limits, speed limits were raised higher than they were before the environmental speed limits were enacted.[210]. 0 share; SHARE ON TWITTER; Share on Facebook On March 16, 2017, the Arkansas House introduced a bill that would allow the state highway commission to increase speed limits up to 75mph (121km/h) in rural interstate freeways, upon completion of a "traffic and engineering investigation" and sets rural non-divided highway speed limits to 65mph (105km/h). [2][7] The 30 miles per hour speed limit is the lowest maximum speed limit of any state or permanently inhabited territory. The only exceptions to the rule are I-385 in Greenville, I-85 in Spartanburg, the SC 31 freeway around Myrtle Beach and I-95 around Florence. What is the minimum speed on an interstate highway? New York has a blanket statutory "Reasonable and Prudent" speed law. If you regularly cross state lines, youve probably noticed that the speed limits shift as soon as you cross the border. 1 Alaska's default speed limit is 55 mph. No provision for license suspension if surcharges are paid. [86] Maryland's urban freeways normally have speed limits of 55mph (like I-495) or 60mph, although some stretches are signed for 65mph travel such as portions of I-95 and I-97 in and around the Baltimore suburbs, I-70 around Frederick, and I-81 around Hagerstown. [76] The Kansas Department of Transportation announced on June 21, 2011, that 807 miles of roadway, comprising the rural areas of I-70, I-35, I-135, the Kansas Turnpike and the freeway-improved sections of US-69 and US-81, will be raised to 75mph. . According to the Federal Highway Administration, some speed limits are determined on a conditional basis. [121] The Route 33 Freehold Bypass section where it is a super two freeway is also 55mph.[122]. In mountainous country like the Cascades and Olympic Mountains, certain twisty roads are limited to 55mph (89km/h), whereas some flat, straight highways in eastern Washington have a limit of 65. These signs typically display a 65mph (105km/h) speed limit, but this limit changes to 55mph (89km/h) on days when air quality is a concern. Are there Minimum Speed Limits in the USA Some states impose a minimum speed limit of 40mph, typically on freeways (motorways) to ensure that traffic using them keeps to a safe speed and flow of traffic. 2023 [168] While the 80mph speed limit was initially signed on all rural freeways in the state, the Interstate 90 stretch from Rapid City to the Wyoming Border returned to 75mph due to safety concerns.[169]. [154] Signs were erected on July 22, 2014. Limited-access divided highways have a minimum speed of 40mph (64km/h),[45] but this is not always posted, and is rarely enforced.