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/ Traffic Control Device Analysis, Testing, and Evaluation Program https://rip.trb.org/View/2731978 Fri, 17 Jul 2026 16:11:43 GMT https://rip.trb.org/View/2731978 Evaluate Traffic Control Devices Viable Use to Reduce Speeding Behavior at High-Low Speed Zone Locations in Michigan https://rip.trb.org/View/2731925 Fri, 17 Jul 2026 14:50:37 GMT https://rip.trb.org/View/2731925 Evaluation of Transit Signal Display Options https://rip.trb.org/View/2716608 Thu, 18 Jun 2026 10:03:43 GMT https://rip.trb.org/View/2716608 Scoping Study: Vertical Visibility Constraints -- Vertical Curvature Traffic Control Devices https://rip.trb.org/View/2709249 Tue, 02 Jun 2026 13:49:43 GMT https://rip.trb.org/View/2709249 Develop and Evaluate Long Median Barrier Gate to Assist with Emergency Response https://rip.trb.org/View/2636104 Mon, 08 Dec 2025 09:44:38 GMT https://rip.trb.org/View/2636104 Placement Options for In-street Pedestrian Crossing Signs (R1-6a) https://rip.trb.org/View/2593953 Thu, 28 Aug 2025 12:29:56 GMT https://rip.trb.org/View/2593953 Research and Assessment of Needs for Sign Maintenance https://rip.trb.org/View/2593930 Thu, 28 Aug 2025 11:32:30 GMT https://rip.trb.org/View/2593930 Evaluating the Effectiveness of Dynamic Speed Feedback Sign (DSFS) at Safety Critical Locations in Connecticut https://rip.trb.org/View/2566902 Wed, 18 Jun 2025 13:29:07 GMT https://rip.trb.org/View/2566902 Size of Regulatory and Warning Signs https://rip.trb.org/View/2558385 Wed, 28 May 2025 14:05:40 GMT https://rip.trb.org/View/2558385 Traffic Control Device (TCD) Consortium (4) https://rip.trb.org/View/2519214 Fri, 07 Mar 2025 17:09:23 GMT https://rip.trb.org/View/2519214 Application of MASH Test Criteria to Breakaway Sign and Luminaire Supports and Crashworthy Work Zone Traffic Control Devices https://rip.trb.org/View/2433905 Mon, 23 Sep 2024 17:40:19 GMT https://rip.trb.org/View/2433905 Field Assessment of Traffic Control Devices https://rip.trb.org/View/2417470 Fri, 16 Aug 2024 09:14:15 GMT https://rip.trb.org/View/2417470 Roadside Safety Device Analysis, Testing, and Evaluation Program https://rip.trb.org/View/2256266 Wed, 27 Sep 2023 15:49:58 GMT https://rip.trb.org/View/2256266 Compliance and Best Practices for Pavement Markings https://rip.trb.org/View/2244520 Thu, 14 Sep 2023 08:49:33 GMT https://rip.trb.org/View/2244520 Legal Problems Arising out of Highway Programs. Topic 27-01. Transportation Agency Liability for Roadside Safety Hardware https://rip.trb.org/View/2209730 Mon, 10 Jul 2023 21:19:27 GMT https://rip.trb.org/View/2209730