Most of Iowa's existing interstate rest areas were constructed during the 1960s and early 1970s. However, current traffic volumes and associated rest area usage have far exceeded original estimates. The new rest area buildings are designed to meet the demands of current and future travelers. Truck and passenger vehicle parking is determined by using an average daily traffic count formula for the service area. Last year the DOT replaced two of the state's outdated facilities.
Improvements are also underway for facilities serving Iowa's interstate gateways.
Other underserved areas being considered for possible future development include a location on Interstate 380 between Cedar Rapids and Waterloo, and on Interstate 80 between Adair and Underwood.