Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2024. 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/ SPR-4852: Safety Performance of Centerline Paved Pavement Markers https://rip.trb.org/View/2253922 Fri, 22 Sep 2023 14:49:39 GMT https://rip.trb.org/View/2253922 Investigation of Retroreflective Pavement Markers (RPMs) in Rumble Strips https://rip.trb.org/View/1939684 Thu, 07 Apr 2022 11:03:03 GMT https://rip.trb.org/View/1939684 Wet Reflective Pavement Markings Evaluation https://rip.trb.org/View/1732707 Tue, 25 Aug 2020 10:50:38 GMT https://rip.trb.org/View/1732707 Safety Evaluation of Sinusoidal Centerline Rumble Strips https://rip.trb.org/View/1710217 Wed, 03 Jun 2020 15:55:17 GMT https://rip.trb.org/View/1710217 SPR-4318: Installation and Maintenance of Raised Pavement Markers at State Transportation Agencies" Synthesis of Current Practices https://rip.trb.org/View/1603310 Thu, 02 May 2019 13:51:25 GMT https://rip.trb.org/View/1603310 Safety and Performance Criteria for Retroreflective Pavement Markers https://rip.trb.org/View/1330734 Thu, 13 Nov 2014 01:01:25 GMT https://rip.trb.org/View/1330734