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Vertical Elements Traffic Circle <br />Purpose <br />A traffic circle is a raised geometric control <br />island, frequently circular, in the center of <br />an intersection of local streets. Typically, <br />traffic circles would be about 20 feet in <br />diameter. Traffic traveling through the <br />intersection must avoid the island affecting <br />the path and speed of the traffic. <br />P <br />■ r � <br />Source: Institute of Transportation Engineers Traffic calming: State of <br />Practice <br />Effects <br />Volumes <br />Little or no effect <br />Speed <br />May reduce speed at intersection <br />Traffic Noise and Air <br />Little or no effect <br />Traffic Safety <br />May decreases vehicle conflicts at intersection <br />Advantages <br />• Reduces speed at intersection approach <br />• Reduces vehicle conflicts at intersection <br />• Provides equal access to intersection for all drivers <br />• Does not restrict access to residents <br />• Can be landscaped <br />Disadvantages <br />• Some parking restrictions required <br />• Local experience has found these devices to be ineffective <br />• Can restrict access for trucks, buses and may increase emergency vehicle <br />response time <br />• Winter Maintenance <br />Problems Targeted <br />• Excessive speeds <br />• Crash history at intersection <br />Design <br />• A minimum of 30 feet of curbside parking must be prohibited at each corner of <br />the intersection <br />APRIL 2005 32 <br />