TRS: Methods for Setting Posted Speed Limits

Status:  Complete
Report Date:  08/15/2012


Traditionally, Minnesota's posted speed limits are determined using the Institute of Transportation Engineers methodology as well as other considerations. The ITE methodology uses field measurements to evaluate roadway segments for the speed at or below which 85 percent of free flowing vehicles are traveling. MnDOT has observed that the ITE methodology often determines a higher operational speed for two-lane rural highways than MnDOT believes is warranted by other engineering and safety considerations. Further, MnDOT is being asked to justify posted limits of 55 mph when statutory limits for such roadways in Minnesota are 65 mph. Consequently, MnDOT would like to identify alternative methods used for determining posted speed limits that produce greater compliance by motorists.

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