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/ Development and Evaluation of Approach Guardrail Transition with Increased Span Length between Concrete bridge Rail and First Transition Post - Phase II https://rip.trb.org/View/2689395 Tue, 02 Jun 2026 12:25:41 GMT https://rip.trb.org/View/2689395 Evaluation of Concrete Models in LS-DYNA to Develop a MASH Test Level 6 (TL-6) Barrier System – Phase I https://rip.trb.org/View/1562291 Tue, 09 Oct 2018 19:25:55 GMT https://rip.trb.org/View/1562291 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