Design vehicles

Adopt both a design vehicle and a control vehicle standard based on context-specific city street types. The design vehicle determines the design of elements such as turning radius and lane width. The control vehicle dictates how the design might accommodate a larger vehicle’s turning needs when using the whole intersection.City transit buses must be able to turn on bus routes without resorting to a 3-point operation. Where a 3-point turn would be necessary, designers should consider removing parking spaces near the intersection or recessing the stop line on the receiving street. Brooklyn, NY. At this intersection, a frequent bus route requires a tight right turn. A recessed stop line paired with a “stop here” sign is used so the bus can complete its turn in one maneuver. Use “crawl” speeds, as opposed to design speed, when determining local street geometry factors associated with the design vehicle. Vehicles traveling at slower speeds have more flexibility and can make difficult turns that may be challenging or unsafe at higher speeds.