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/ Impact of Pavement and Weather Conditions on Traffic Speed at Sharp Horizontal Curves https://rip.trb.org/View/2646943 Mon, 05 Jan 2026 23:07:35 GMT https://rip.trb.org/View/2646943 Development of a Network-Level Data-Driven High Friction Surface Treatment Location Selection Approach Leveraging Remote Sensing Technologies https://rip.trb.org/View/2643023 Thu, 18 Dec 2025 14:36:51 GMT https://rip.trb.org/View/2643023 High Friction Surface Treatment Decision-Making Criteria https://rip.trb.org/View/2640691 Tue, 16 Dec 2025 09:20:39 GMT https://rip.trb.org/View/2640691 Evaluating Method 2 Horizontal Curvature in Freeway Work Zones: Safety, Suitability, and Alternatives https://rip.trb.org/View/2608464 Mon, 13 Oct 2025 19:12:31 GMT https://rip.trb.org/View/2608464 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 Performance-Based Superelevation Design Criteria https://rip.trb.org/View/2381751 Thu, 23 May 2024 10:24:25 GMT https://rip.trb.org/View/2381751 SPR 771 Safety Analysis of Highway Curves Where Crashes Occur in South Carolina https://rip.trb.org/View/2334168 Thu, 01 Feb 2024 09:47:34 GMT https://rip.trb.org/View/2334168 Evaluation of Post Mounted Delineators and Curve Warning Message Markings https://rip.trb.org/View/2219413 Wed, 26 Jul 2023 08:38:49 GMT https://rip.trb.org/View/2219413 An Enhanced Network-level Curve Safety Assessment and Monitoring Using Low-cost Mobile Devices – Refinement and Field Evaluation https://rip.trb.org/View/2140092 Mon, 20 Mar 2023 17:23:16 GMT https://rip.trb.org/View/2140092 Improve the Technical Capacity of Transportation Safety Professionals at all Levels of Government to Advance Safety Programs https://rip.trb.org/View/2093188 Tue, 03 Jan 2023 13:53:44 GMT https://rip.trb.org/View/2093188 Advancing Safety Prediction Methodologies for Horizontal Curves https://rip.trb.org/View/1953246 Tue, 17 May 2022 11:30:13 GMT https://rip.trb.org/View/1953246 Research for AASHTO Standing Committee on Highways. Task 404. Reevaluation of the Side Friction Values used to Determine Horizontal Curve Radii Using Crash Data https://rip.trb.org/View/1877227 Tue, 07 Sep 2021 14:04:05 GMT https://rip.trb.org/View/1877227 Development of a Crashworthy Tangent End Treatment for Low-Speed and Curbed Roadways https://rip.trb.org/View/1854184 Tue, 25 May 2021 22:20:39 GMT https://rip.trb.org/View/1854184 Updating and Implementing the Grade Severity Rating System for Wyoming Mountain Passes, Phase 2 https://rip.trb.org/View/1715319 Thu, 18 Jun 2020 13:58:02 GMT https://rip.trb.org/View/1715319 Crashworthiness of Roadside Hardware on Curbed Roadways https://rip.trb.org/View/1707180 Thu, 21 May 2020 10:31:36 GMT https://rip.trb.org/View/1707180