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Highway Safety Features

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Roundabouts in Iowa

Learn about Iowa Highway Safety Features

  • 4-to-3 Lane Conversion

    4-to-3 lane conversions restripe 4 lane roads to two in each direction and a left turn lane, reducing crashes by half.

  • Automated Traffic Enforcement

    Lists areas where automated traffic enforcement is used.

  • Reduced Conflict Intersections

    These intersections reduce the number of points where vehicles can inadvertently come into contact with others.

  • Roundabouts

    Roundabouts reduce crashes, traffic delays, fuel consumption, air pollution, and construction and maintenance costs.

  • Diverging Diamond Interchange (DDI)

    DDIs move traffic to the opposite side of the crossroad between the two ramp intersections tp improve safety.

  • Speed Feedback Signs

    Speed feedback signs are proven traffic calming devices placed along state highways within a community. 

Data

Safety Dashboards

Browse data on traffic safety areas, such as unprotected occupants, crashes, speed, impaired driving, injuries, work zones, and more.

Access our safety dashboards
Buckle up your critters

 

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Department of Transportation

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Iowa Department of Transportation Central Office

800 Lincoln Way
Ames, IA 50010

Phone

515-239-1101

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