Idaho Speed Limit

Idaho State Speed Limits
Idaho State Speed Laws

What is the Idaho speed limit?

Idaho traffic laws define the maximum speed that any motorist travelling on Idaho roadways can legally drive. Driving over the Idaho speed limit can result in a traffic citation, fine, license suspension, or even arrest.

Rural Idaho has freeway speed limits as high as 80 mph as of 2014, with speeds as high as 55 mph allowed on roads with traffic lights. Active school zones have a special speed limit of 25 mph.

Idaho has one of the highest speed limits in the United States. Only 1 state legally allows speeds faster than the Idaho maximum speed limit of 80 miles per hour.



Idaho Speed Limit - Rural Freeways

The maximum speed limit on rural freeways and interstates in Idaho is 80 miles per hour. "Rural freeways" are the sections of major highways that passing through rural and sparsely populated areas, and can safely allow faster driving. Rural highways will generally have the highest legal speed limits in Idaho.

In Idaho, trucks have a reduced maximum speed limit of 70 mph on rural freeways.



Idaho Speed Limit - Urban Freeways

The maximum speed limit on urban freeways and interstates in Idaho is 65 miles per hour. "Urban freeways" are the segments of large highways that are located within a city or densely populated area's limits, and are generally more prone to traffic congestion and other hazards.

In most cases, the freeway's speed limit will return to the rural freeway speed limit of 80 mph after the road passes through the most densely populated area.



Idaho Speed Limit - Divided Roads

The maximum speed limit on divided roads in Idaho is 70 miles per hour. Divided roads must have a concrete median or buffer zone separating opposite lanes, and may have one or more lanes going in the same direction.

Unlike many states that allow higher speed limits on divided roads, Idaho has the same maximum speed limit for both divided and undivided roads.



Idaho Speed Limit - Undivided Roads

The maximum speed limit on rural undivided roads roads in Idaho is 70 miles per hour. This category includes most small backroads and local routes.

When these routes pass through a residential or heavily-trafficked area, the speed limit will usually drop to 30 mph or below.



Idaho Speed Limit - Residential Areas

The maximum speed limit on residential roads in Idaho is 30 miles per hour. Residential roads have the most potential for speed-based accidents and collisions, so residential districts tend to have the lowest speed limits with the most strict enforcement policies.

When driving in residential areas be on the lookout for school, hospital, and construction zones. These areas often have even lower speed limits, with strict enforcement and heavy fines for speeding.

Idaho Speeding Tickets and Citations

Driving over the posted speed limit, driving too fast for conditions, or failing to obey special speed limit zones can result in a Idaho speeding ticket, points on your license, and even a license suspension or revocation for repeat offenders.

Idaho highway patrol officers monitor traffic using radar, speed traps, and cameras. Radar technology is not exact, and as a general rule an officer will not pull you over for exceeding the speed limit by less than 5 mph (85 mph on a rural freeway, or 75 mph on an rural undivided road). However, any speeds in excess of the posted speed limits can be considered a ticketable offence.