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/ Improving Safety, Privacy, and Innovation: Distracted Driving Mitigation Strategies for Arizona https://rip.trb.org/View/2780412 Fri, 18 Sep 2026 17:26:52 GMT https://rip.trb.org/View/2780412 Freeway Management System Modernization https://rip.trb.org/View/2780410 Fri, 18 Sep 2026 17:18:58 GMT https://rip.trb.org/View/2780410 State of Project review Nationwide DOT use of GIS for Environmental Planning and Compliance. AZTI FY2026-C1-PS1 https://rip.trb.org/View/2780405 Fri, 18 Sep 2026 16:58:16 GMT https://rip.trb.org/View/2780405 Artificial Intelligence Policies at State Departments of Transportation: The State of the Practice https://rip.trb.org/View/2780402 Fri, 18 Sep 2026 16:47:50 GMT https://rip.trb.org/View/2780402 Liquid Nitrogen-Cooled Concrete https://rip.trb.org/View/2778088 Wed, 16 Sep 2026 11:01:26 GMT https://rip.trb.org/View/2778088 Update of ACRP Report 4: Ground Access to Airports by Public Transportation https://rip.trb.org/View/2772536 Thu, 03 Sep 2026 08:39:47 GMT https://rip.trb.org/View/2772536 Synthesis of Information Related to Transit Practices. Topic SC-10. Planning and Implementation Considerations for Alternative Propulsion Transit Vehicles in Rural Public Transportation https://rip.trb.org/View/2772538 Thu, 03 Sep 2026 08:35:03 GMT https://rip.trb.org/View/2772538 Synthesis of Information Related to Transit Practices. Topic SG-23. Data-Driven Approaches for Optimizing Transit Parts Procurement, Lead Time Risk, and Critical Spare Parts Planning https://rip.trb.org/View/2772554 Tue, 01 Sep 2026 17:16:59 GMT https://rip.trb.org/View/2772554 Synthesis of Information Related to Transit Practices. Topic SG-22. Inter-Jurisdictional Approaches to Cost Sharing for Regional Transit Services https://rip.trb.org/View/2772555 Tue, 01 Sep 2026 17:10:44 GMT https://rip.trb.org/View/2772555 Synthesis of Information Related to Transit Practices. Topic SE-09. Transit Cleanliness – Understanding the Current Condition and Perceptions Across the Transit Industry https://rip.trb.org/View/2772560 Tue, 01 Sep 2026 11:28:49 GMT https://rip.trb.org/View/2772560 Synthesis and Verification of Link Slab Practices for Jointless Bridge Decks in Accelerated Bridge Construction (ABC) https://rip.trb.org/View/2744923 Fri, 07 Aug 2026 08:21:45 GMT https://rip.trb.org/View/2744923 Evaluation of Transit Signal Display Options https://rip.trb.org/View/2716608 Thu, 18 Jun 2026 10:03:43 GMT https://rip.trb.org/View/2716608 Research for the AASHTO Standing Committee on Planning. Task 90. Best Practices in the Use of Microsimulation Models https://rip.trb.org/View/2706285 Wed, 27 May 2026 15:09:20 GMT https://rip.trb.org/View/2706285 Quick-Response Research on Long-Term Strategic Issues. Task 56. Transit Fare Programs for High School and Postsecondary Students https://rip.trb.org/View/2636148 Mon, 08 Dec 2025 20:08:55 GMT https://rip.trb.org/View/2636148 Sequencing for Phases with Flashing Yellow Arrow https://rip.trb.org/View/2608463 Mon, 13 Oct 2025 18:57:17 GMT https://rip.trb.org/View/2608463