Corridors with transit vehicles should be designed assuming lower acceleration and deceleration rates than passenger vehicles. Normal acceleration should be estimated at 3 ft/s2 and normal deceleration should be estimated at 2 ft/s2. When vehicles with standing passengers use a corridor, the design should limit maximum deceleration to 8 ft/s2. This may significantly affect the yellow times for signalized intersections.

Note that while the maximum deceleration for transit vehicles is less than the 11.2ft/s2 normally assumed for stopping sight distance for passenger vehicles, the driver’s eye height of a transit vehicle is usually significantly higher than the 3.5-ft used for passenger vehicles, allowing for greater sight distance over crest vertical curves. For sag vertical curves the headlights on transit vehicles are usually mounted higher than passenger vehicles, which should provide for greater sight distance at night. Note that increased driver eye Table of Contents Instructions Reference Links Roadway Design Manual | 22-6 height/headlight height does not increase sight distance around horizontal obstructions, so transit-heavy corridors may need to be evaluated with larger sight triangles that might be normally used for passenger vehicles.