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/ 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 Freeway Corridor Economic Impact https://rip.trb.org/View/2606590 Fri, 03 Oct 2025 15:21:21 GMT https://rip.trb.org/View/2606590 Investigation of Vulnerable Road User Fatalities and Serious Injuries on Freeways https://rip.trb.org/View/2601433 Thu, 18 Sep 2025 00:57:24 GMT https://rip.trb.org/View/2601433 SPR-5018: Connected Freeway and Signalized Corridor Pilot: C-V2X Technologies Deployment for Enhanced Safety and Efficiency in Indiana https://rip.trb.org/View/2590602 Tue, 19 Aug 2025 15:00:54 GMT https://rip.trb.org/View/2590602 Evaluation of the Effectiveness of Installed Wrong-Way Driving Countermeasures on Florida Freeways and Arterials https://rip.trb.org/View/2563982 Mon, 16 Jun 2025 09:21:07 GMT https://rip.trb.org/View/2563982 Missouri Work Zone Speed Study https://rip.trb.org/View/2548661 Wed, 30 Apr 2025 09:40:30 GMT https://rip.trb.org/View/2548661 Development and Implementation of Coordinated Adaptive Ramp Metering (CARM) in Southern California Interstates for Congestion Mitigation https://rip.trb.org/View/2506242 Fri, 07 Feb 2025 16:07:17 GMT https://rip.trb.org/View/2506242 Freeway and Arterial Performance and Safety Analysis with High Resolution Vehicle Trajectory Data https://rip.trb.org/View/2431597 Tue, 17 Sep 2024 17:43:12 GMT https://rip.trb.org/View/2431597 Synthesis: Prevention of Unauthorized Freeway Exits and Entrances https://rip.trb.org/View/2420102 Fri, 23 Aug 2024 12:55:11 GMT https://rip.trb.org/View/2420102 NCHRP Implementation Support Program. Using Information from CAVs To Enhance Freeway Operational Strategies https://rip.trb.org/View/2406712 Tue, 23 Jul 2024 12:56:41 GMT https://rip.trb.org/View/2406712 Applicability of the 85th Percentile for Setting Speed Limits on Freeways, Expressways, and Rural Highways https://rip.trb.org/View/2381738 Wed, 22 May 2024 11:45:33 GMT https://rip.trb.org/View/2381738 Safe and efficient automated freeway traffic control https://rip.trb.org/View/2292644 Mon, 20 Nov 2023 19:52:28 GMT https://rip.trb.org/View/2292644 Safety Effectiveness of Inside Shoulder Widths on Freeways in Georgia https://rip.trb.org/View/2269991 Tue, 17 Oct 2023 12:08:11 GMT https://rip.trb.org/View/2269991 Evaluating the Effectiveness of the Strategic Response Plan to Wrong-way Driving Events on Freeways https://rip.trb.org/View/2071695 Tue, 29 Nov 2022 11:46:18 GMT https://rip.trb.org/View/2071695 CARMA Integrated Highway Prototype (IHP) https://rip.trb.org/View/2062774 Thu, 17 Nov 2022 11:56:23 GMT https://rip.trb.org/View/2062774