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/ Development and Evaluation of Approach Guardrail Transition with Increased Span Length between Concrete bridge Rail and First Transition Post - Phase II https://rip.trb.org/View/2689395 Tue, 02 Jun 2026 12:25:41 GMT https://rip.trb.org/View/2689395 Investigating the Performance of Corrosion-Resistant GFRP-Reinforced Bridge Railings with Open Expansion Joints https://rip.trb.org/View/2529965 Fri, 28 Mar 2025 08:24:10 GMT https://rip.trb.org/View/2529965 SPR-4924: Numerical Modeling for Assessment and Evaluation of New and Retrofitted Bridge Rails Under Impact Load https://rip.trb.org/View/2434101 Wed, 25 Sep 2024 09:23:07 GMT https://rip.trb.org/View/2434101 Development of MASH TL-4 and TL-5 Bridge Guardrail for Replacement of Historic Bridge Rail https://rip.trb.org/View/2417073 Mon, 12 Aug 2024 13:26:33 GMT https://rip.trb.org/View/2417073 Support for AASHTO Committees and Councils. Roadmap for the Transformation to Computer Simulation-Based Assessment of Bridge Railings https://rip.trb.org/View/2350716 Tue, 12 Mar 2024 10:10:02 GMT https://rip.trb.org/View/2350716 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 Feasibility Study of Low-Cement Concrete Mixes with E5 Internal Cure and Liquid Fly Ash https://rip.trb.org/View/2201940 Fri, 23 Jun 2023 12:46:47 GMT https://rip.trb.org/View/2201940 Comprehensive Evaluation of Design Standards, Materials, and Construction for Slip Formed Concrete Bridge Railings to Alleviate Sources of Early Age Deterioration https://rip.trb.org/View/2047348 Tue, 18 Oct 2022 15:57:09 GMT https://rip.trb.org/View/2047348 Impact Test of GFRP Reinforced Concrete Bridge Barriers https://rip.trb.org/View/1945929 Sat, 30 Apr 2022 11:44:56 GMT https://rip.trb.org/View/1945929 Design and Numerical Evaluation of GFRP Reinforcement for Concrete Bridge Railing https://rip.trb.org/View/1762372 Thu, 07 Jan 2021 14:02:10 GMT https://rip.trb.org/View/1762372 Pooled Fund for the Design, Development and Testing of a Box Beam Approach Guardrail Transition and an MGS Approach Guardrail Transition to a MASH TL-4 Three Steel Tube Bridge Rail https://rip.trb.org/View/1632294 Mon, 01 Jul 2019 20:46:55 GMT https://rip.trb.org/View/1632294 MASH Railing Load Requirements for Bridge Deck Overhang https://rip.trb.org/View/1628606 Sat, 08 Jun 2019 10:12:05 GMT https://rip.trb.org/View/1628606 Crash Testing of a Precast Concrete Barrier TPF-5(367) https://rip.trb.org/View/1601790 Wed, 24 Apr 2019 11:09:37 GMT https://rip.trb.org/View/1601790 Proposed Modification to AASHTO LRFD Bridge Design Specifications, Section 13—Railing https://rip.trb.org/View/1571372 Mon, 03 Dec 2018 15:30:31 GMT https://rip.trb.org/View/1571372 SPR-4311: Evaluating Reserve Strength of Girder Bridges due to Bridge Rail Load Shedding https://rip.trb.org/View/1530317 Tue, 07 Aug 2018 10:51:47 GMT https://rip.trb.org/View/1530317