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/ Audible Warning System on TMA and Maintenance Trucks https://rip.trb.org/View/2675924 Mon, 02 Mar 2026 11:25:35 GMT https://rip.trb.org/View/2675924 Evaluation of the Performance of Rumble Strips on Pavements Where Seal Coats Have Been Applied https://rip.trb.org/View/1647625 Mon, 26 Aug 2019 15:02:25 GMT https://rip.trb.org/View/1647625