About the DOT

Rush hour traffic
DID YOU KNOW? Motor vehicles on Iowa's
public roads traveled an estimated 33.78
billion miles in 2019.

TRAFFIC COUNTS

  • The busiest spot on Iowa's roadways is on I-235 in Des Moines between 56th Street and 42nd Street where the average daily traffic in 2019 was 133,200 vehicles per day. View traffic counts by county or city.
  • Motor vehicles on Iowa's public roads traveled an estimated 33.78 billion miles in 2019.
  • The Primary Road System, which is managed by the Iowa DOT, represents 8.3 percent of the total road mileage in the state. However, these roads carry 62.8 percent of all vehicular traffic. (2019)
  • The weighted average daily traffic count on Iowa's Interstate Highway System is 24,751 vehicles in rural areas and 46,123 in municipal areas. (2019)
  • The weighted average daily traffic count on rural county roads is 168 vehicles. The weighted average on municipal streets is 1,253 vehicles. (2019)