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/ Optimize Tradeoffs between Centerline Buffers, Lane Width, and Shoulders for Rural Undivided Highways https://rip.trb.org/View/2652072 Fri, 09 Jan 2026 16:29:38 GMT https://rip.trb.org/View/2652072 Effects of Airplane Cabin Interiors on Egress I - updates based on NASEM review https://rip.trb.org/View/2625303 Thu, 13 Nov 2025 09:26:34 GMT https://rip.trb.org/View/2625303 Impact Evaluation for Obstacles within Barrier's Working Width https://rip.trb.org/View/2558421 Mon, 26 May 2025 21:48:15 GMT https://rip.trb.org/View/2558421 Effectiveness and Guidance of Aggressive Rehabilitation of Gravel Roads https://rip.trb.org/View/2508946 Tue, 11 Feb 2025 18:50:09 GMT https://rip.trb.org/View/2508946 Effect of Bridge Width on Crashes in Nebraska https://rip.trb.org/View/2387176 Tue, 04 Jun 2024 12:42:19 GMT https://rip.trb.org/View/2387176 National Investigation of the Environmental, Safety and Livability Impacts of Travel Lane Width: Evidence from 10 American Cities https://rip.trb.org/View/2331768 Thu, 01 Feb 2024 10:04:47 GMT https://rip.trb.org/View/2331768 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 SPR-4853: Effective Shoulder Width on Rural Highway System Related to Roadway Departure Crashes https://rip.trb.org/View/2238833 Thu, 31 Aug 2023 16:43:43 GMT https://rip.trb.org/View/2238833 SPR-4730: Widening Reinforced Concrete Elements using Chemical Anchoring Systems (Post-installed Rebar Systems) https://rip.trb.org/View/2057910 Sun, 06 Nov 2022 16:08:09 GMT https://rip.trb.org/View/2057910 Best Practices for MOT on Interstate Pavement Rehabilitation Projects https://rip.trb.org/View/2039846 Wed, 12 Oct 2022 12:57:50 GMT https://rip.trb.org/View/2039846 Testing of Cable Median Barrier in a Narrow Ditch https://rip.trb.org/View/1847748 Tue, 20 Apr 2021 10:18:49 GMT https://rip.trb.org/View/1847748 Guidelines for Selecting Lane Widths on Urban and Suburban Arterials https://rip.trb.org/View/1673345 Tue, 17 Dec 2019 12:24:30 GMT https://rip.trb.org/View/1673345 SPR-4126: Implementation of LiDAR-Based Mobile Mapping System for Lane Width Evaluation and Reporting in Work Zones for INDOT Traffic Management https://rip.trb.org/View/1435599 Wed, 23 Nov 2016 10:39:08 GMT https://rip.trb.org/View/1435599 Transportation System Performance Measurement Using Existing Loop Infrastructure (102-FH2-005) SBIR Phase II https://rip.trb.org/View/1370726 Tue, 29 Sep 2015 15:51:44 GMT https://rip.trb.org/View/1370726 Operational and Safety Considerations in Making Lane Width Decisions on Urban and Suburban Arterials https://rip.trb.org/View/1331125 Tue, 18 Nov 2014 01:00:43 GMT https://rip.trb.org/View/1331125