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/ Develop Guidance for Enhancing Work Zone Safety in the Construction of Innovative Intersections https://rip.trb.org/View/2614517 Tue, 28 Oct 2025 12:08:30 GMT https://rip.trb.org/View/2614517 Restricted Crossing U-Turn (RCUT) Design Guidance https://rip.trb.org/View/2593933 Thu, 28 Aug 2025 11:32:31 GMT https://rip.trb.org/View/2593933 Economic Analysis of RCUT Access Impacts in Georgia https://rip.trb.org/View/2508954 Wed, 12 Feb 2025 07:28:26 GMT https://rip.trb.org/View/2508954 Examining Driver Hand-off and Take-over of AVs at J-turn Intersections https://rip.trb.org/View/2425219 Thu, 05 Sep 2024 10:50:45 GMT https://rip.trb.org/View/2425219 Analyze Operational and Safety Improvements Associated with Implemented Innovative Intersections in Texas https://rip.trb.org/View/2420101 Fri, 23 Aug 2024 12:46:35 GMT https://rip.trb.org/View/2420101 Rural Intersection Enhancement and Driver Behavior Study https://rip.trb.org/View/2377924 Tue, 07 May 2024 15:49:00 GMT https://rip.trb.org/View/2377924 Safety Performance and Design Considerations of Restricted Crossing U-Turns (RCUTs) in Mississippi https://rip.trb.org/View/2260080 Thu, 05 Oct 2023 10:45:55 GMT https://rip.trb.org/View/2260080 Evaluation of Alternative Geometric Designs on Highway Corridors - Case Study of J Turns https://rip.trb.org/View/1251900 Wed, 05 Jun 2013 01:01:14 GMT https://rip.trb.org/View/1251900