MoDOT to add J-turns on Route M in Jefferson County

JEFFERSON COUNTY- The Missouri Department of Transportation will be adding J-turns at St. Luke’s Church Road and Moss Hollow Road on Route M in Jefferson County.

Construction for the project is set to begin this summer and is expected to be completed by Summer 2022. Anticipated impacts have not been finalized for construction details. MoDOT will work with business owners and residents to ensure access is available during construction.

The purpose of this project is to improve safety and reduce crashes by lower the number of conflict points by adding J-turns. A J-turn is a specialized intersection where, rather than crossing traffic, motorists turn right, merge into the left lane and then make a U-turn at a designated point. J-turns have been proven to greatly reduce right-angle crashes, which are most responsible for fatalities and serious injuries at intersections. 

This project cost approximately $1 million.

To view more about the project, visit our website here:

For additional information about the Route M project, please contact Franklin/Jefferson County Project Manager, Shirley Norris at (314) 314-565-5648 or via email at


Districts Involved
St. Louis