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Effects <br />Volumes <br />Speed <br />Traffic Noise and Air <br />Traffic Safety <br />Vary depending on proportion of traffic that is prohibited by the median barrier <br />Small reduction possible <br />Little or no effect <br />May provide some safety benefits for pedestrians as a safety island for crossing <br />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 />Maintenance of island required <br />Reduction in access for residents <br />Problems Targeted <br />Cut through traffic <br />Vehicle conflicts <br />Design <br />Must meet drainage requirements <br />Must not significantly impede emergency vehicle access <br />Vertical Elements <br />Median Barrier <br />Purpose <br />A physical means for preventing left turning traffic on <br />a major street from accessing a local street and <br />through traffic from continuing on that local street. <br />Altemate routes fro diverted traffic should be <br />analyzed with regard to traffic carrying capacity and <br />desirability. <br />Source: Institute of Transportation Engineers <br />Traffic Calming: State of Practice <br />APRIL 2005 <br />31 <br />