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<br />II Roadway Adjustments <br /> <br />Chicane II <br /> <br />Purpose <br />Curvilinear reconstruction involving the <br />introduction of curvatures on previously <br />straight alignment. Curvilinear <br />reconstruction can be accomplished in two <br />different ways: <br />1 . Reconstruct the street with a <br />curved centerline alignment and a <br />uniform roadway width <br />2. Introduce chokers or other types of <br />barriers on alternate sides of the <br />street to create a serpentine travel <br />path. <br /> <br /> <br />l!A <br />~"~. <br />~----, rr...... <br /> <br />'--p~ <br />=:J, <br />uoEjG ~ <br /> <br /> <br /> <br />Source: Institute of Transportation Engineers Traffic Calming: State of <br />Practice <br /> <br />Effects <br />Volumes Possible reduction in volumes <br />Speed Possible reduction in speeds <br />Traffic Noise and Air Little to no effect <br />Traffic Safety Little or no effect <br />Advantages . Possible reduction in volumes and speed <br /> . No restriction in access to residents <br /> . Can be landscaped enhanced <br /> . Less disruptive for emergency vehicles than speed humps <br />Disadvantages . Curbside parking must be prohibited in some locations <br /> . Winter maintenance problems <br /> . Possible impacts to drainage <br /> . High cost of reconstruction <br />Problems Targeted . Excessive speeds <br />Design . Not appropriate for narrow streets (22 feet is appropriate width) <br /> <br />APRil 2005 <br /> <br />27 <br />