What is the post spacing for W-beam guardrails?
The post spacing for W-beam guardrails generally follows standard guidelines set by the Federal Highway Administration (FHWA). According to various sources found through a Google search, typical spacing is about 6 feet 3 inches (1.9 meters) for strong post installations. This spacing ensures that the guardrails perform effectively in redirecting vehicles in the event of a collision, thus enhancing road safety.
W-beam Guardrail Repair Guide - Safety
A Guide for Highway and Street Maintenance Personnel
November
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ACKNOWLEDGEMENTS
This guide was prepared by Vanasse Hangen Brustlin, Inc. (VHB) under FHWA Contract DTFH61-05-D-. Ms. Leslie Wright from the Federal Highway Administration Office of Safety initially managed the task order, later succeeded by Dr. Clayton Chen. Principal investigator William J. Fitzgerald, P.E., contributed as a consultant from PerformTech, Inc., alongside technical editors Dr. Hugh McGee, P.E. and Ms. Vicki Glenn and document preparer Ms. Michelle Scism from VHB.
...ASSESS DAMAGE EXTENT AND REPAIR
Upon arriving at a damaged guardrail site, it’s essential to clear any debris from the traffic lanes and shoulders. Set up temporary warning devices, like cones and drums, in accordance with the Manual on Uniform Traffic Control Devices (MUTCD) if the guardrail becomes nonfunctional and cannot be repaired immediately.
STANDARD SECTION
The standard W-beam section serves to prevent vehicle penetration while smoothly redirecting the vehicle. The following chart assists in determining functionality categories based on the damage extent:
STANDARD SECTION OF W-BEAM| EXTENT OF DAMAGE | FUNCTIONALITY |
|---|---|
| RAIL ELEMENT SEPARATED | 1 |
| RAIL ELEMENT TORN | 1 | TOP OF RAIL HEIGHT ≤ 24" | 1 | ...
END TREATMENT SECTION
The end treatment's role is to minimize occupant injury when struck at the end and to provide tension during side impacts.
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