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Effects <br />Volumes <br />Speed <br />Traffic Noise and Air <br />Traffic Safety <br />Little or no effect 5 <br />Drivers generally ignore posted speed limits and travel at speeds which the <br />drivers consider reasonable <br />Little or no effect. <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 />Traffic Control Devices <br />Speed Limits <br />Purpose <br />Speed limits are determined by the Minnesota <br />Department of Transportation (consistent with <br />State Statutes) based on an analysis of the actual <br />speed profile of the road. The basic premise of <br />Minnesota's law is that the majority of motorists <br />will pick a safe and reasonable speed given the <br />horizontal and vertical design of the street, locations of <br />driveways, sidewalks, obstructions, and the use of the street <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 />APRIL 2005 <br />r <br />SPEED <br />LIMIT <br />30 <br />EDUCE <br />SPEED <br />AHEAD <br />'PEED <br />LIMIT <br />20 <br />