§**Nebraska
Department of Road, NDOR **

¥** University
of Nebraska Lincoln, **

¥** Department
of Civil Engineering College of Engineering and Technology: **

¥** Research
Report No. TRP-02-26-92 **

¥** Evaluation
of Lower Speed Limits on Urban Highways: **

§*Ò**SAFETY EFFECTS *

¥* The results of the analysis of the
accident experience in speed zones indicate **that zones with posted speed limits equal to the reasonable
speed limits **proposed by the NDOT method of speed zoning
are safer than zones posted **with limits that are
5 and 10 mph below the reasonable speed limits. Speed **zones with speed limits 5 mph below the reasonable speed
limits were found to **have 5 percent more
accidents than zones with reasonable speed limits. Speed **zones with speed limits 10 mph below the reasonable speed
limits were found **to have 10 percent more accidents than
zones with reasonable speed limits. **Therefore, the speed
zones on state highways in urban areas should be posted **with reasonable speed limits proposed by NDOR method in order
to minimize **the numbers of accidents in the speed
zones. Speed limits lower than the **reasonable speed
limits should not be posted.**Ó*