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Iowa Department of Transportation
http://www.dot.state.ia.us/
DOT news releases, motor vehicles information, road conditions, and traveling reports.
Iowa Highways
http://iowahighways.home.mchsi.com/
Route log and exit list.
Iowa Map Goofs Redux
http://www.angelfire.com/ia3/roadgeek/goofs05.html
Illustrates official 2005 highway map error notes.