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/ Cost Effective Roundabouts: Evaluate Options for Reducing Roundabout Footprints and Construction Costs https://rip.trb.org/View/2636041 Fri, 05 Dec 2025 14:19:53 GMT https://rip.trb.org/View/2636041 Development of a VR Transportation Simulator https://rip.trb.org/View/2625582 Tue, 18 Nov 2025 15:38:46 GMT https://rip.trb.org/View/2625582 Are Current Rigid Pavement Roundabout Designs Working in Minnesota? https://rip.trb.org/View/2487311 Wed, 08 Oct 2025 11:57:15 GMT https://rip.trb.org/View/2487311 Evaluating Pedestrian Considerations for Transit Advantage at Roundabouts https://rip.trb.org/View/2606593 Fri, 03 Oct 2025 15:58:10 GMT https://rip.trb.org/View/2606593 Virtual Reality as a Tool to Enhance the Design Review Process https://rip.trb.org/View/2606404 Thu, 02 Oct 2025 15:07:13 GMT https://rip.trb.org/View/2606404 Benefit-Cost Analysis of Roundabouts to Support Long Range Investment Policy https://rip.trb.org/View/2594028 Thu, 28 Aug 2025 16:17:48 GMT https://rip.trb.org/View/2594028 Research Synthesis: Design and Impacts of Rural Roundabouts https://rip.trb.org/View/2577109 Fri, 18 Jul 2025 10:11:22 GMT https://rip.trb.org/View/2577109 Environmental Impact of Roundabouts https://rip.trb.org/View/2566963 Wed, 18 Jun 2025 16:13:59 GMT https://rip.trb.org/View/2566963 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 Crash Modification Factors for 2 by 1, Peanut-Shaped and Oval-Shaped Roundabouts https://rip.trb.org/View/2536234 Fri, 11 Apr 2025 01:47:37 GMT https://rip.trb.org/View/2536234 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 Roundabouts, J-Turn, etc. - Understanding their Economic Impacts https://rip.trb.org/View/2414044 Wed, 07 Aug 2024 17:23:45 GMT https://rip.trb.org/View/2414044 Speed Impacts from Roundabouts and Other Traffic Control Devices https://rip.trb.org/View/2414011 Wed, 07 Aug 2024 09:25:08 GMT https://rip.trb.org/View/2414011 Roundabout Connected/Automated Vehicle Active Inference Control Strategies to Improve Safety for All Users https://rip.trb.org/View/2329136 Sun, 28 Jan 2024 12:32:39 GMT https://rip.trb.org/View/2329136 Rectangular Rapid Flashing Beacons Experimental Feature Project https://rip.trb.org/View/2151373 Wed, 12 Apr 2023 18:56:41 GMT https://rip.trb.org/View/2151373