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/ Evaluation of Alternative Intersection and Interchange Options for Nebraska https://rip.trb.org/View/2689408 Tue, 02 Jun 2026 12:26:34 GMT https://rip.trb.org/View/2689408 Safety and Operational Performance Assessment of CFIs and DDIs in Utah https://rip.trb.org/View/2632836 Thu, 27 Nov 2025 08:54:32 GMT https://rip.trb.org/View/2632836 Evaluating the Economic and Safety Trade-offs of Interchange and Access Drive Separation Distances https://rip.trb.org/View/2627344 Wed, 19 Nov 2025 14:36:56 GMT https://rip.trb.org/View/2627344 Optimizing Operation of Diverging Diamond Interchange with Automated Vehicles https://rip.trb.org/View/2625312 Thu, 13 Nov 2025 15:39:35 GMT https://rip.trb.org/View/2625312 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 Develop a Data-Driven Intersection & Interchange Control Evaluation (DIICE) Tool https://rip.trb.org/View/2614516 Tue, 28 Oct 2025 11:20:20 GMT https://rip.trb.org/View/2614516 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 Assessment of Safety and Operation Performances of CFIs and DDIs in Utah https://rip.trb.org/View/2394799 Thu, 20 Jun 2024 16:23:48 GMT https://rip.trb.org/View/2394799 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 Development of Guidelines for Implementing the Flipped Left Diamond Interchange Design https://rip.trb.org/View/2283483 Mon, 30 Oct 2023 22:58:36 GMT https://rip.trb.org/View/2283483 Mitigating Community Harms of Dense Highway Infrastructure - Spaghetti Junctions https://rip.trb.org/View/2244268 Tue, 12 Sep 2023 12:23:12 GMT https://rip.trb.org/View/2244268 Assessing Safety Performance of Atypical Service Interchanges https://rip.trb.org/View/2219016 Tue, 25 Jul 2023 08:09:40 GMT https://rip.trb.org/View/2219016 Guide for Pedestrian and Bicycle Safety at Alternative Intersections and Interchanges (A.I.I.) https://rip.trb.org/View/2166263 Mon, 01 May 2023 17:59:41 GMT https://rip.trb.org/View/2166263 Development of Crash Modification Factors for Comparing Standard Diamond Interchange to Other Common Interchange Designs https://rip.trb.org/View/2021862 Tue, 13 Sep 2022 11:00:18 GMT https://rip.trb.org/View/2021862 Safety and Traffic Operations at Cloverleaf Interchanges https://rip.trb.org/View/2008580 Wed, 17 Aug 2022 09:01:06 GMT https://rip.trb.org/View/2008580