Railing on the outside edge of a bridge with adjacent pedestrian walkway must be 42 inches minimum in height, measured from the top of the walkway.

A vehicular bridge with a speed of 45 mph or below is considered a low-speed facility, and it does not require a separator railing if pedestrians use it and a raised sidewalk is used. A bridge with a speed 50 mph and above is considered a high-speed facility, and it must have a separator railing if pedestrians use it. See Appendix B, "Acceptable Placement of Bridge Railing for Vehicular and Non-vehicular Traffic," for more information.