(Speed limit in miles per hour)
|State||Interstate||Other limited-access roads1||Other roads|
|Arizona||75||65||65||65; trucks: 65|
|Arkansas||70; trucks: 65||55||601||55|
|California||70; trucks: 55||65; trucks: 55||70; trucks: 55||65; trucks: 55|
|District of Columbia||n/a||55||n/a||25|
|Idaho||75; trucks: 65||75||65||65|
|Indiana||70; trucks: 65||55||60||55|
|Kentucky||65; 70 on specified segments of road3||65||65||55|
|Michigan||70 (trucks 60); <70 (trucks 55)||65||70||55|
|Montana||75; trucks: 65||65||day: 70; night: 65||day: 70; night: 65|
|Ohio||65; 70 on Ohio Turnpike||65||55||55|
|Oregon||65; trucks: 55||55||55||55|
|Texas||75; 80 or 85 on specified segment of road4||75||75||75|
|Utah||75; specified segments of road may have posted limits that exceed 755||65||75||65|
|Washington||70; trucks: 60||60||60||60|
1Based on traffic and engineering studies, the speed limit may be raised on particular two-lane or four-lane highways to 65mph.
2In Hawaii, the maximum speed limit is established by county ordinance or by the director of transportation.
3In Kentucky, the speed limit may be increased to 70 mph on specific segments of highway upon the basis of an engineering and traffic investigation.
4In sections of I-10 and I-20 in West Texas and sections of Highway 45 in Travis County, the speed limit for passenger cars and light trucks is 80 mph. Speed limits may be established not to exceed 85 mph if the highway is originally constructed and designed to accommodate the higher speed and it has been determined by an engineering study to be reasonable and safe. State Highway 130 (portions toll) is operating with a posted limit of 85 mph, effective October 2012.
52013 UT HB 83 expands the portion of roads that may be posted at speed limits that exceed 75 mph to include a portion of Interstate 15 that is between milepost 244 and milepost 24 or between milepost 366 and the Utah-Idaho state line; a portion of Interstate 80 that is between milepost 99 and the Utah-Nevada state line; or a portion of Interstate 84 that is between the Tremonton Interchange and the Utah-Idaho state line. The new limits, reportedly 80 mph, will become effective upon signage.
6In Virginia, the posted limit may be as high as 70 mph where indicated by lawfully placed signs, erected subsequent to a traffic engineering study, effective July 2010.
NOTES: Interstates are divided into urban and rural sections based primarily on population size and population density. Many roads, particularly urban interstates, often have a lower posted speed limit than the maximum allowable shown in this table.
SOURCE: Insurance Institute for Highway Safety, Highway Loss Data Institute, Maximum posted speed limits, available at www.iihs.org/laws/SpeedLimits.aspx as of April 2013.