Iowa DOT News Release

Iowa DOT offering new service to travelers of the I-235 corridor in Des Moines beginning tomorrow #iatraffic

Posted on: May 20, 2014

AMES, Iowa – May 20, 2014 – Beginning Wednesday morning, May 21, motorists along the Des Moines Interstate 235 corridor will be able to use a new travel-time information service provided by the Iowa Department of Transportation’s digital message boards during morning and afternoon rush hours.

Each message board will display travel-time between the current location and two upcoming intersections. Travel times will be displayed on the boards from 6 a.m. to 9 a.m. and 3 p.m. to 6 p.m. Monday through Friday. The message boards will also display a slow speed message “XX mph speed ahead” when traffic speed is 25 percent or lower than the posted speed of the roadway. Travel time information can also be viewed from any Internet-enabled device by clicking the “Electronic Signs” link on:

The travel times and slow speed warnings are calculated by collecting traffic speed information every 20 seconds from existing Iowa DOT traffic sensors. The sensors also collect a variety of traffic information used by the Iowa DOT such as traffic counts, vehicle classifications, and lane occupancy.

“Many metropolitan areas across the country are already using digital message boards to display travel times, said Mike Jackson, Iowa DOT’s traffic operations engineer. “We are excited to be able to provide this service to travelers and commuters in Iowa. It’s one more piece of information that will help drivers make more informed travel decisions.”

The project is being piloted along the I-235 corridor. The Iowa DOT plans to expand travel-time reporting to other commuter corridors across the state.


Contact: Michael Jackson at 515-290-1295 or


Iowa highway in the evening