Before revision: Design, advantages and disadvantages The Pedestrian and Bicycle Information Center advises that curb extensions ought not encroach on travel lanes, bicycle lanes, or shoulders, and should not extend more than 1.8 m (6 ft) from the curb.Pedestrian and Bicycle Information Center, "Crossing Enhancements," URL , retrieved 23 June 2010 Some curb extensions are built with the bike lane passing through (making the extension an island, separated from the main sidewalk by a narrow bike lane).
After revision: , a body funded by the US Federal Highway Administration,Design, advantages and disadvantages The Pedestrian and Bicycle Information Center advises that curb extensions ought not encroach on travel lanes, bicycle lanes, or shoulders, and should not extend more than 1.8 m (6 ft) from the curb.Pedestrian and Bicycle Information Center, "Crossing Enhancements," URL , retrieved 23 June 2010 Some curb extensions are built with the bike lane passing through (making the extension an island, separated from the main sidewalk by a narrow bike lane).