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/ Effectiveness of Speed Reduction in Work Zones https://rip.trb.org/View/2772559 Tue, 01 Sep 2026 11:44:38 GMT https://rip.trb.org/View/2772559 Effectiveness of School Zone Speed Limits as a Traffic Calming Strategy https://rip.trb.org/View/2762674 Wed, 19 Aug 2026 16:30:17 GMT https://rip.trb.org/View/2762674 Evaluate Traffic Control Devices Viable Use to Reduce Speeding Behavior at High-Low Speed Zone Locations in Michigan https://rip.trb.org/View/2731925 Fri, 17 Jul 2026 14:50:37 GMT https://rip.trb.org/View/2731925 Intelligent Speed Assistance Guide for State Highway Safety Offices https://rip.trb.org/View/2720300 Thu, 02 Jul 2026 20:16:13 GMT https://rip.trb.org/View/2720300 Synthesis of Information Related to Highway Practices. Topic 57-05. Statewide Speed Management Practices Supporting the Safe System Approach https://rip.trb.org/View/2630488 Wed, 26 Nov 2025 16:24:24 GMT https://rip.trb.org/View/2630488 SPR-5017: Safety Performance of Setting Speed Limits Based on Roadway Alignment https://rip.trb.org/View/2600573 Tue, 16 Sep 2025 10:36:08 GMT https://rip.trb.org/View/2600573 Evaluation of Driver Speeds After Implementation of Speed Limit Reduction on Urban Streets https://rip.trb.org/View/2487333 Fri, 18 Jul 2025 10:39:17 GMT https://rip.trb.org/View/2487333 Evaluation of Digital Speed Limit Signs in Work Zones https://rip.trb.org/View/2562260 Fri, 06 Jun 2025 14:32:42 GMT https://rip.trb.org/View/2562260 Speed Modification Factors within the Safe System Approach https://rip.trb.org/View/2558365 Thu, 29 May 2025 13:17:35 GMT https://rip.trb.org/View/2558365 Using Vehicle Probe Data to Evaluate Speed Limits on Texas Highways https://rip.trb.org/View/2553168 Wed, 14 May 2025 10:06:54 GMT https://rip.trb.org/View/2553168 Selection, Integration, and Effectiveness Study of Input Data for Nebraska Variable Speed Signs on I-80 https://rip.trb.org/View/2507247 Mon, 10 Feb 2025 14:01:19 GMT https://rip.trb.org/View/2507247 Study the Effectiveness of ODOT’s Initiatives in Construction Work Zone Safety https://rip.trb.org/View/2480322 Wed, 01 Jan 2025 13:28:08 GMT https://rip.trb.org/View/2480322 Designing for Target Speed https://rip.trb.org/View/2437305 Mon, 30 Sep 2024 17:13:25 GMT https://rip.trb.org/View/2437305 Semi-Automation of Interstate-90 Variable Speed Limit (I-90 VSL) Corridor in Ohio's Advanced Traffic Management System (ATMS) https://rip.trb.org/View/2431342 Tue, 17 Sep 2024 14:37:15 GMT https://rip.trb.org/View/2431342 Applicability of the 85th Percentile for Setting Speed Limits on Freeways, Expressways, and Rural Highways https://rip.trb.org/View/2381738 Wed, 22 May 2024 11:45:33 GMT https://rip.trb.org/View/2381738