Listen to Highway Advisory Radio

Highway advisory radio (HAR) provides traffic information to motorists along our highway system. Iowa has three HAR sites that use low-powered FM signals. They are located along the I-80 corridor near Adair and DeSoto, I-29 near Sloan, and I-380 near Urbana.

Due to FCC restrictions on available frequencies, use of low-powered FM HAR is not feasible in metropolitan areas. In the Des Moines area, Iowa DOT is using the new generation of AM radio (SuperHAR) technology to reach greater numbers of motorists with real-time traffic information relating to the reconstruction of I-235. The AM SuperHAR uses the same voice recognition technology and programming utilized in automating the low powered FM HAR deployments. Two AM SuperHAR transmitters have been installed in Des Moines.

HAR is an extension of Iowa's 511 travel information system. The information supplied to travelers includes all that is available through the CARS/511 system, as well as any alerts.

State HAR map

(Uses Real Player)

Existing highway advisory radio locations : Des Moines, DeSoto, Adair, Oakdale, Davenport, Sloan, Sioux City and Urbana.

Iowa Map with Har Locations Sloan 94.5 Adair 102.9 Adair 102.9 Des Moines OakDale 1080 AM Davenport 1680 AM Des Moines OakDale 1080 AM Davenport 1680 AM Grimes 1670 AM DeSoto 104.9 FM DeSoto 104.9 FM Grimes 1670 AM Urbana 99.9 FM Urbana 99.9 FM Sioux City 1680 AM Sioux City 1680 AM Council Bluffs


Sioux City 1680 AM | Sloan 94.5 | Council Bluffs 1680 AM | Grimes 1670 AM | Adair 102.9
Des Moines 1670 AM | DeSoto 104.9 | Urbana 99.9 FM | Oakdale 1680 AM | Davenport 1680 AM

The Research and Technology Bureau enhances the DOTís ability to deliver efficient and effective transportation services by actively promoting research partnerships, knowledge and technology transfer, information technology, and Intelligent Transportation Systems (ITS).

Peggi Knight, Director | Ph: 515-239-1530