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<br />II Vertical Elements <br /> <br />Traffic Circle II <br /> <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 /> <br />3i~~ <br /> <br /> <br />7jQ""~~ ~. _~_~__ <br /> <br /> <br />T~i 10: f'f <br /> <br />Source: Institute of Transportation Engineers Traffic Calming: State of <br />Practice <br /> <br />Effects <br />Volumes Little or no effect <br />Speed May reduce speed at intersection <br />Traffic Noise and Air Little or no effect <br />Traffic Safety May decreases vehicle conflicts at intersection <br />Advantages . 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 . 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 . Excessive speeds <br /> . Crash history at intersection <br />Design . A minimum of 30 feet of curbside parking must be prohibited at each corner of <br /> the intersection <br /> <br />APRIL 2005 <br /> <br />32 <br />