Several intersections in Iowa are notably dangerous due to factors like heavy traffic, complicated layouts, poor signage or lighting, and high speeds. The most perilous ones include:
US Highway 30 and Interstate 80 in Ames
US Highway 20 and Interstate 380 in Waterloo
US Highway 20 and Interstate 35 in Coralville
US Highway 30 and Interstate 35 in Tama
US Highway 20 and Interstate 80
Authorities and safety organizations identify such intersections by analyzing crash data, focusing on the number, severity, and nature of accidents, alongside common contributory factors and trends.