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/ 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 SPR-5020: Identifying Locations with Abnormally High Wrong Way Driving or Interstate U-Turns https://rip.trb.org/View/2577103 Thu, 17 Jul 2025 15:59:18 GMT https://rip.trb.org/View/2577103 A Guide on Alternative Intersections and Interchanges https://rip.trb.org/View/2381742 Wed, 22 May 2024 12:59:54 GMT https://rip.trb.org/View/2381742 Developing sight distance guidelines for U-turn maneuvers https://rip.trb.org/View/2339986 Thu, 15 Feb 2024 14:41:43 GMT https://rip.trb.org/View/2339986 Developing Crash Modification Factors for Alternative Intersections https://rip.trb.org/View/1854205 Fri, 28 May 2021 19:25:54 GMT https://rip.trb.org/View/1854205 Evaluation of Cost‐effective Alternative Designs for Rural Expressway Intersections https://rip.trb.org/View/1635479 Thu, 04 Jul 2019 10:24:09 GMT https://rip.trb.org/View/1635479 Investigation of Driving Behavior at Alternative Intersection Designs and Safety Improvement: A Driver Simulator Study https://rip.trb.org/View/1593709 Wed, 20 Mar 2019 08:57:03 GMT https://rip.trb.org/View/1593709