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/ High Tension Cable Median Guardrail Expected Lifespan https://rip.trb.org/View/2487331 Wed, 08 Oct 2025 09:59:25 GMT https://rip.trb.org/View/2487331 SPR-5010: Feasibility Study of Deploying Movable Barriers as Permanent Barriers and Temporary Traffic Barriers for Future Roadway Design, Construction, and Maintenance https://rip.trb.org/View/2601511 Thu, 18 Sep 2025 16:09:18 GMT https://rip.trb.org/View/2601511 Design and Safety Considerations of Center Line Barriers https://rip.trb.org/View/2558364 Thu, 29 May 2025 13:19:57 GMT https://rip.trb.org/View/2558364 Impact Evaluation for Obstacles within Barrier's Working Width https://rip.trb.org/View/2558421 Mon, 26 May 2025 21:48:15 GMT https://rip.trb.org/View/2558421 Modeling Wolf Creek Pass Combination of Layers of Barriers https://rip.trb.org/View/2431164 Mon, 16 Sep 2024 08:56:10 GMT https://rip.trb.org/View/2431164 Conduct MASH Test Level 3 (TL-3) Evaluations of Concrete Barriers on Roadside Slopes https://rip.trb.org/View/2420100 Fri, 23 Aug 2024 12:30:34 GMT https://rip.trb.org/View/2420100 Development of Critical Impact Point and Impact Angle Guidance for the Manual for Assessing Safety Hardware (MASH) https://rip.trb.org/View/2381727 Tue, 21 May 2024 16:42:58 GMT https://rip.trb.org/View/2381727 Method for Using ISPEs in Crash-Testing Protocols https://rip.trb.org/View/2381712 Tue, 21 May 2024 15:29:37 GMT https://rip.trb.org/View/2381712 SPR-4807: Mobile Work Barrier Implementation Study https://rip.trb.org/View/2270074 Wed, 18 Oct 2023 14:46:00 GMT https://rip.trb.org/View/2270074 Laboratory Evaluation of Fresh and Hardened Concrete Comprising Type IP Portland-Pozzolan Cement https://rip.trb.org/View/2263680 Fri, 06 Oct 2023 16:55:08 GMT https://rip.trb.org/View/2263680 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 Barrier Striping for the Reduction of Accidents https://rip.trb.org/View/2255816 Wed, 27 Sep 2023 13:43:08 GMT https://rip.trb.org/View/2255816 Verification and Validation Guidelines to Use Simulation as a Alternative to Full-scale Crash Testing https://rip.trb.org/View/2222558 Mon, 31 Jul 2023 16:36:47 GMT https://rip.trb.org/View/2222558 Guidelines for Crash Testing Roadside Safety Hardware for Motorcycles https://rip.trb.org/View/2219019 Tue, 25 Jul 2023 08:46:27 GMT https://rip.trb.org/View/2219019 Crashworthiness of Roadside Hardware Impacted by Battery Electric Vehicles https://rip.trb.org/View/2219021 Tue, 25 Jul 2023 08:22:35 GMT https://rip.trb.org/View/2219021