Iowa Speed Limit

Iowa State Speed Limits
Iowa State Speed Laws

What is the Iowa speed limit?

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

Iowa has a speed limit of 20mph in business districts, 25mph in school zones, and residential areas. In suburban area the speed limit is 45mph. Secondary roads allow up to 55mph between sunrise and sunset and lower the speed limit to 50 for during sunset to sunrise. In work zones the speed limit varies from 25 – 55mph.

There are a total of 16 states with higher maximum speed limits than Iowa.



Iowa Speed Limit - Rural Freeways

The maximum speed limit on rural freeways and interstates in Iowa is 70 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 Iowa.

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



Iowa Speed Limit - Urban Freeways

The maximum speed limit on urban freeways and interstates in Iowa 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 70 mph after the road passes through the most densely populated area.



Iowa Speed Limit - Divided Roads

The maximum speed limit on divided roads in Iowa is 65 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.

Because the median helps protect drivers from head-on collisions, Iowa has a higher maximum speed limit for divided roads than undivided roads.



Iowa Speed Limit - Undivided Roads

The maximum speed limit on rural undivided roads roads in Iowa is 55 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 25 mph or below.



Iowa Speed Limit - Residential Areas

The maximum speed limit on residential roads in Iowa is 25 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.

Iowa 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 Iowa speeding ticket, points on your license, and even a license suspension or revocation for repeat offenders.

Iowa 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 (75 mph on a rural freeway, or 60 mph on an rural undivided road). However, any speeds in excess of the posted speed limits can be considered a ticketable offence.