Advisory Speed Posting Guide
|Regulatory Speed Limit||Work Zone Speed Limit||Advisory Speed**
In Advance of the Activity Area
Signs from Beginning of Work Zone
* A regulatory speed limit up to 10 MPH below the normal speed limit may be established without an engineering and traffic study, provided the reduced regulatory speed limit is at least 25 MPH. Regulatory speed limits less than 25 MPH or more than 10 MPH below the normal speed limit require an engineering and traffic study and the prior approval of the District Traffic Engineer for state designated highways and approval of a Traffic Engineer as determined by local authorities for local highways. To qualify for an additional speed limit reduction, the engineering and traffic study must indicate that traffic queues, erratic maneuvers, high vehicle crash rates, or undesirable working conditions exist on the project or have existed on similar projects.
** Use of advisory speed plaques is optional.