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/ Study to Understand the Influence of Emergency Vehicle Color, Reflectance, Signing/Arrow Boards, and Lighting Configurations in Reducing Responder-Involved Crashes https://rip.trb.org/View/2642797 Wed, 17 Dec 2025 15:58:45 GMT https://rip.trb.org/View/2642797 Quantitative Analysis of Reflective Glass Beads for Heavy Metals https://rip.trb.org/View/2077945 Tue, 06 Dec 2022 09:48:38 GMT https://rip.trb.org/View/2077945