Four- to Three-Lane Conversions 

The ultimate goal of four- to three-lane conversions is safety: reducing vehicle collisions and traffic speeds. In 2019, conversions were implemented on Clinton Street and Mormon Trek Boulevard. Portions of Gilbert Street are also being reviewed for this treatment.

In 2020 Keokuk Street, south of Highway 6 will be converted from 4 lanes to 3 lanes. This will help to slow traffic entering connecting residential streets, including Sandusky, where vehicle speeds have been an issue. Madison Street will be converted from 4 lanes to 3 in 2022.

The following videos shows how four- to three-lane conversions work and the benefits measured by the DOT on roads throughout Iowa. The video below is used with permission from the Iowa DOT.

Traffic Calming Program

The goal of Iowa City’s Neighborhood Traffic Calming Program is to reduce excessive speeding and/or traffic volumes on streets. Participation in the program is neighborhood-initiated and is not imposed by the City. To find out more about the traffic calming program, view the traffic calming brochure.

Recently completed traffic calming projects

  • Highland Avenue, from Boyrum Street to Keokuk Street 
    • Speed humps installed 2020.
  • Willow Street, from Muscatine Avenue to Brookside Drive
    • Speed humps installed in 2020.
  • Kimball Road
    • Existing speed humps on Kimball Road reconstructed in 2020.
  • Hickory Trail
    • Speed humps installed in 2020.
  • Jefferson Street/Glendale Road, between Clapp Street and 7th Avenue
    • Modified speed humps installed in 2020.
  • 7th Avenue, Glendale Road to Court Street
    • Current phase: pilot program installed October 2018.

The City installed two radar feedback signs along 7th Avenue. Traffic speeds were remeasured in 2019, showing that 85 percentile speeds between College and Court Streets have been reduced by 2 MPH for northbound vehicles (from 32.5 MPH in 2015 to 29.6 in 2019); and by 0.7 MPH for the southbound vehicles (34.2 MPH in 2015 and 33.5 MPH in 2019). North of College Street 85th percentile speeds increased in the northbound lane (from 30 MPH in 2015 to 32 MPH in 2019), while in the southbound lane speeds dropped nearly 3 MPH (from 32.7 MPH in 2015 to 29.6 MPH in 2019).

Average speeds have been reduced south of College Street to 25 MPH in the northbound lane to 29 in the southbound lane. North of College Street, average speeds have remained relatively unchanged but under 30 MPH.

Traffic calming on 7th Avenue

Residents on the following streets have petitioned the City for traffic calming

  • Dover Street, from Muscatine to Perry Court
  • Friendship Street, from Upland to Meadow Street

Contact Information 

For questions about Iowa City’s Neighborhood Traffic Calming Program, contact Assistant Transportation Planner Sarah Walz at 319-356-5239 or