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35 <br /> <br />Curb Extensions <br />Curb extensions, also known as neckdowns, bulb-outs, or bump-outs, are created by <br />extending the sidewalk at corners or mid-block. In addition to shortening crossing <br />distances, curb extensions can be used to change the geometry of intersections resulting <br />in smaller corner radii that slow turning movements of motor vehicles. <br /> <br />Guidance <br />• Curb extensions should be considered where parking is present or where motor <br />vehicle traffic deflection is provided through other curbside uses such as bicycle <br />share stations or parklets. They cannot be installed where the curbside lane is a <br />vehicle travel lane. <br />• Curb extensions are particularly valuable in locations with high volumes of <br />pedestrian traffic, near schools, at unsignalized pedestrian crossings, or where <br />there are demonstrated pedestrian safety issues. <br />Considerations <br />• The turning needs of emergency, transit, and other large vehicles must be <br />considered in curb extension design. <br />• Care should be taken to maintain direct routes across intersections by aligning <br />pedestrian desire lines on either side of the sidewalk. Curb extensions often make <br />this possible as they provide extra space for grade transitions.