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<br />I Traffic Control Devices <br /> <br />Speed Limits <br /> <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 /> <br />SPEED <br />LIMIT <br />30 <br /> <br /> <br />PEED <br />IMIT <br />2 <br /> <br />Volumes Little or no effect <br /> <br />Speed Drivers generally ignore posted speed limits and travel at speeds which the <br />drivers consider reasonable <br /> <br /> <br />Effects <br /> <br />Traffic Noise and Air Little or no effect. <br /> <br />Traffic Safety 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 /> <br />Advantages . Research indicates that when speed limits are set at or near the 85th percentile <br />speed, roadway crash frequencies are at a minimum. <br /> <br />Disadvantages . Speed limits on urban roadways are either set by Statute or by MnDOT. <br /> <br />. Research suggests that crash frequencies on urban roadways are unrelated to <br />vehicle speeds. <br /> <br />Problems Targeted . High speeds through residential neighborhood <br /> <br />Design <br /> <br />APRil 2005 <br /> <br />20 <br />