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Median Barrier <br />Vertical Elements <br />Purpose <br />A physical means for preventing left turning traffic <br />on a major street from accessing a local street <br />andthrough traffic from continuing on that local <br />street. Alternate routes for diverted traffic should <br />be analyzed with regard to traffic carrying <br />capacity and desirability. <br />Source: Institute of Transportation Engineers <br />Traffic Calming: State of Practice <br />Effects <br />Volumes <br />Vary depending on proportion of traffic that is prohibited by the median <br />barrier. <br />Speed <br />Small reduction possible. <br />Traffic Noise and Air <br />Little or no effect. <br />Traffic Safety <br />May provide some safety benefits for pedestrians as a safety island for <br />crossing the major street. <br />Advantages <br />• Assists in pedestrian crossing. <br />• Prevents vehicles from passing vehicles that are turning right. <br />• May improve safety through access limitations. <br />• Visually enhances the street. <br />Disadvantages <br />• Diversion of traffic to other locations possible. <br />• Disrupts continuity of local street system. <br />•Landscaped islands require additional maintenance. <br />• Reduction in access for residents. <br />Problems Targeted <br />• Cut through traffic. <br />•Vehicleconflicts. <br />Design <br />• Must meet drainage requirements. <br />• Must not significantlyimpede emergency vehicle access. <br /> <br />