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/ Safety Performance of Safe System Treatments for Corridors and Intersections that May Impact Capacity https://rip.trb.org/View/2712178 Tue, 09 Jun 2026 15:00:53 GMT https://rip.trb.org/View/2712178 Vision and Roadmap for the Next Generation of the Highway Capacity Manual https://rip.trb.org/View/2558383 Wed, 28 May 2025 14:08:54 GMT https://rip.trb.org/View/2558383 Development of U.S. Vehicle Capacity Models for Multilane and Turbo Roundabouts https://rip.trb.org/View/2558402 Wed, 28 May 2025 09:52:47 GMT https://rip.trb.org/View/2558402 Lifecycle Economic and Energy Efficiency Benefits of Managed Lane Corridors in Metro Atlanta https://rip.trb.org/View/2508942 Tue, 11 Feb 2025 16:13:39 GMT https://rip.trb.org/View/2508942 Induced Travel Policy Brief https://rip.trb.org/View/2494999 Fri, 31 Jan 2025 16:36:48 GMT https://rip.trb.org/View/2494999 An Updated Capacity Model for Mini-Roundabouts https://rip.trb.org/View/2452918 Fri, 15 Nov 2024 16:06:05 GMT https://rip.trb.org/View/2452918 Synthesis of Information Related to Highway Practices. Topic 56-05. Traffic Analysis Practices for Non-Motorized Modes https://rip.trb.org/View/2384705 Fri, 31 May 2024 20:33:32 GMT https://rip.trb.org/View/2384705 National Investigation of the Environmental, Safety and Livability Impacts of Travel Lane Width: Evidence from 10 American Cities https://rip.trb.org/View/2331768 Thu, 01 Feb 2024 10:04:47 GMT https://rip.trb.org/View/2331768 Recommended Lengths for Arterial Lane Drops - Phase 2 https://rip.trb.org/View/2286547 Mon, 06 Nov 2023 14:48:21 GMT https://rip.trb.org/View/2286547 RES2024-02: Applying Induced Travel Study in Urban Areas in Tennessee https://rip.trb.org/View/2233685 Fri, 25 Aug 2023 11:25:30 GMT https://rip.trb.org/View/2233685 Field Evaluation of All-Way Stop Control Intersection Capacity https://rip.trb.org/View/2221850 Thu, 27 Jul 2023 16:54:53 GMT https://rip.trb.org/View/2221850 SPR-4857: Statewide Screening of Signalized Intersections for Capacity Improvements https://rip.trb.org/View/2209597 Mon, 10 Jul 2023 09:14:40 GMT https://rip.trb.org/View/2209597 Synthesis of Information Related to Highway Practices. Topic 55-20. Traffic Capacity Level of Service Adaptations and Usage https://rip.trb.org/View/2190458 Fri, 09 Jun 2023 12:43:14 GMT https://rip.trb.org/View/2190458 Estimating HCM Default Parameters for Louisiana https://rip.trb.org/View/2096075 Mon, 09 Jan 2023 10:45:38 GMT https://rip.trb.org/View/2096075 FY 22/23 Florida Local Technical Assistance Programs https://rip.trb.org/View/2035746 Thu, 06 Oct 2022 11:12:20 GMT https://rip.trb.org/View/2035746