Iowa Department of Transportation
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Traffic Counts

  • The busiest spot on Iowa's roadways is on I-235 in Des Moines near 31st Street where the average daily traffic in 2008 was 125,100 vehicles per day. For traffic counts by county or city click here.
  • Motor vehicles on Iowa's public roads traveled an estimated 30.95 billion miles in 2008.
  • The Primary Road System, which is managed by the Iowa DOT, represents 8.2 percent of the total road mileage in the state. However, these roads carry 60.5 percent of all vehicular traffic. (2008)
  • The weighted average daily traffic count on Iowa's Interstate Highway System is 20,164 vehicles in rural areas and 43,751 in municipal areas. (2008)
  • The weighted average daily traffic count on rural county roads is 166 vehicles. The weighted average on municipal streets is 1,335 vehicles. (2008)