Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Develop Transition for MASH Test Level 4 (TL-4) Compliant Guardrail System https://rip.trb.org/View/1879853 Thu, 23 Sep 2021 11:37:13 GMT https://rip.trb.org/View/1879853 Pooled Fund for the Design, Development and Testing of a Box Beam Approach Guardrail Transition and an MGS Approach Guardrail Transition to a MASH TL-4 Three Steel Tube Bridge Rail https://rip.trb.org/View/1632294 Mon, 01 Jul 2019 20:46:55 GMT https://rip.trb.org/View/1632294 Investigation, Dynamic Testing, and Evaluation of Guardrail Posts for Use in Transitions between Temporary Concrete Barrier and Guardrail https://rip.trb.org/View/1251922 Wed, 05 Jun 2013 01:01:44 GMT https://rip.trb.org/View/1251922