Specifications include, but are not limited to:
St. Charles County is seeking assistance of a consultant for design, project management, and
procurement of roadway improvements including the reduction of island and modifying the
pavement markings on the side streets at Missouri Route 94 and Zumbehl Road/Friedens Road
and Missouri Route 94 and Pralle Lane to accommodate concurrent left turning and through
moving vehicles. The option to operate concurrent left turns on the side streets will provide for a
more efficient signal operation at two of the more critical intersections along this corridor and
thus reduce delay and emissions.
It is also proposed to have a qualified traffic engineer develop signal timing plans following the
roadway and signal improvements to ensure the network of intersections are operating at their
This project will utilize the already installed Gateway Green Light travel time devices to
document the travel time data under the current geometrics and signal timing plans as the
existing baseline. This baseline will then be monitored and compared to travel time
data collected during and after construction.