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Traffic Control Devices Speed Limits <br />Purpose SPEED <br />Speed limits are determined by the Minnesota LIMIT <br />Department of Transportation consistent 0 <br />State Statutes) based on an analysis of the e actual <br />speed profile of the road. The basic premise of tEDUCE <br />Minnesota's law is that the majority of motorists <br />will pick a safe and reasonable speed given the SPEED <br />horizontal and vertical design of the street, locations of WEED driveways, sidewalks, obstructions, and the use ofthe street AHEAD LIMIT <br />by pedestrians. Lowering the speed limit to address speeding in <br />a neighborhood has never proven to be even moderately effective <br />without also including very high levels of enforcement. <br />Effects <br />Volumes <br />Little or no effect <br />Speed <br />Drivers generally ignore posted speed limits and travel at speeds which the <br />drivers consider reasonable <br />Traffic Noise and Air <br />Little or no effect. <br />Traffic Safety <br />Effects of speed limit changes on traffic safety on local residential streets have <br />not been reported. Research suggests that crash frequencies on urban roadways <br />are unrelated to vehicle speeds. <br />Advantages <br />• Research indicates that when speed limits are set at or near the 85th percentile <br />speed, roadway crash frequencies are at a minimum. <br />Disadvantages <br />• Speed limits on urban roadways are either set by Statute or by MnDOT. <br />• Research suggests that crash frequencies on urban roadways are unrelated to <br />vehicle speeds. <br />Problems Targeted <br />• High speeds through residential neighborhood <br />Design <br />n RiL2005 <br />