Logged in as: Public User

Weak-Post Guardrail Improvements

State NE
Description Text

We found this weak post guardrail approved on the FHWA web site & plan to use it soon.


With the design showing washers in front of the w-beam should we build as is?


Now with the 31" MGS passed without blockouts we will switch to that in the future.


  • Guardrail
Other Keywords none
Date November 1, 2011


I am aware that this TL-2 weak-post, W-beam guardrail system was developed and successfully crash tested with a small, thin square washer placed on the front face of the rail. I recall that a smaller hex head bolt was also used with this system to attach the rail to the posts and allow for the rail to easily release away from the posts due to bolt fracture. The version noted below in the link is shown as a TL-2 barrier. However, I recall other modifications being incorporated into the system which resulted in acceptable safety performance under TL-3 within a study conducted for PennDOT. I have attached a draft copy of the TRB paper on this topic. I will see if I can obtain an electronic version of the final paper.

Date November 9, 2011
Attachment WPI-Weak-Post-Guardrail-TRB_01-2282.pdf

Contact Us:
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
(402) 472-0965
Email: mwrsf@unl.edu
The information contained on the Midwest Roadside Safety Facility (MwRSF) website is subject to change without prior notice. The University of Nebraska and the MwRSF is not responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use or misuse of or reliance upon any such content, goods, or services available on this site.