Section 2: Bridge Railing for PedestriansAnchor: #i999049
A vehicular bridge with a design speed of 45 mph or less is considered a low-speed facility, and it does not require a separator railing if pedestrians use it. A bridge with a design speed above 45 mph is considered a high-speed facility, and it must have a separator railing if pedestrians use it.Anchor: #i999064
- Combination Railing. Combination
railing is designed for use on the outside of raised sidewalks when
no separator railing is used on a facility with design speeds of
45 mph or less. It is sometimes used, though not typically required,
as separator railing between traffic on a high- or low-speed facility
and an at-grade sidewalk.
Only Combination Railing Types C402, C412 and C4(S) are currently approved for use on a high speed facility.
Openings between horizontal or vertical members on pedestrian railing must be small enough that a 6-inch sphere cannot pass through them in the lower 27 inches. For the portion of pedestrian railing that is higher than 27 inches, openings may be spaced such that an 8-inch sphere cannot pass through them.
- Separator Railing. Separator
railing may be appropriate on lower speed bridges that are close to
schools or that have significant pedestrian traffic. Sites should
be evaluated on a case-by-case basis.
When using a separator railing, attach a metal-beam guard fence and terminate it at the edge of the roadway shoulder, letting pedestrians walk behind the guard fence. If needed, a crash cushion can be used to absorb railing end impact energy. A curb will adversely affect the performance of a barrier terminal.
- Protective Containment Cages. Some
pedestrian-use bridges and walkways may pose a threat to vehicles
or trains from vandals throwing objects. These bridges and walkways
may have a protective containment cage for
the pedestrians. It is a local or railroad company decision about
whether a fence or containment cage is required at a particular
site. Full containment cages on Texas bridges require minimum headroom
for all walks and tunnels of 8 ft. More headroom may be required
based on the needs of users.
The CLF-RO standard drawing provides details for an 8 ft. chain link fence attached to the backside of a limited number of concrete parapets for the purpose of railroad protection.
- Pedestrian-only Railing. Railing
bridges in Texas must comply with the geometry and strength requirements
of current AASHTO LRFD Bridge Design Specification1. Pedestrian railing openings
between horizontal or vertical members must be small enough that a
6-inch sphere cannot pass through them in the lower 27 inches. For
the portion of pedestrian railing that is higher than 27 inches,
openings may be spaced such that an 8-inch sphere cannot pass through
Requirements for sidewalks in Texas are documented in the Roadway Design Manual, Chapter 2, Section 6.