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Roadway Adjustments Chokers at Intersections <br />Purpose <br />Narrowing of the street at an intersection <br />to constrain the width of the traveled way. They <br />provide shorter pedestrian crossing distances <br />and provide protection to the beginning of a <br />parking lane. The driver also senses the roadway <br />narrowing when approaching one of these <br />measures, which can result in speed reduction <br />and a reminder that the driver is entering a <br />residential area. <br />nw <br />MLIMS <br />Source: Institute of Transportation Engineers <br />Traffic Calming. State of Pracfce <br />Effects <br />Volumes <br />Little or no effect <br />Speed <br />Minimal changes <br />Traffic Noise and Air <br />Little or no effect. <br />Traffic Safety <br />Potential for improved pedestrian safety due to shorter street crossing times, but <br />at the same time bicycle safety may be compromised by physically removing part <br />of the pavement surface. <br />Advantages <br />• Good for pedestrians due to shorter crossing distance <br />• Provides space for landscaping and neighborhood "gateway" <br />• Should not affect emergency response time <br />• Minimal inconvenience to drivers <br />Disadvantages <br />• May require the prohibition of on- street parking causing hardship or <br />inconvenience for residents <br />• May cause bicyclists to travel in same traffic lane as vehicles <br />• May require redesign of drainage system <br />Problems Targeted <br />• Mid -block locations with speeding and /or cut - through traffic <br />Design <br />• There must be adequate turning radius for emergency vehicle access <br />especially on narrow streets <br />APRIL 2005 25 <br />