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/ Zero- and Reduced-Fare Transit Policy and Post-Pandemic Recovery: A Multi-Agency Analysis of Ridership, Service Supply, and Access https://rip.trb.org/View/2697838 Thu, 30 Apr 2026 08:37:11 GMT https://rip.trb.org/View/2697838 Optimization-Based Framework and Decision-Support Tool for Bridge Toll Implementation Under Behavioral and Operational Constraints https://rip.trb.org/View/2696158 Mon, 27 Apr 2026 19:59:05 GMT https://rip.trb.org/View/2696158 TRB Core Program Services for a Highway RD&T Program – Federal Fiscal Year 2026/TRB (State DOTs) Fiscal Year 2027 https://rip.trb.org/View/2692353 Tue, 14 Apr 2026 20:24:09 GMT https://rip.trb.org/View/2692353 Personal Vehicle Ownership and Operating Cost Calculator (Version 2.0) for Quantifying On-road Vehicle Operating Costs https://rip.trb.org/View/2691663 Sun, 12 Apr 2026 23:22:20 GMT https://rip.trb.org/View/2691663 Successful Applications of Alternative Delivery Methods by Highway Agencies to Accelerate Project Delivery https://rip.trb.org/View/2681234 Tue, 17 Mar 2026 15:10:13 GMT https://rip.trb.org/View/2681234 Innovative Approaches in Acquiring New or Replacement Fleet Equipment https://rip.trb.org/View/2681240 Tue, 17 Mar 2026 14:49:34 GMT https://rip.trb.org/View/2681240 Federal Transportation Funding Utilization by States and Strategies to Maximize Efficient and Effective Use https://rip.trb.org/View/2666776 Mon, 09 Feb 2026 20:44:35 GMT https://rip.trb.org/View/2666776 Strategic Approaches to Managing Emerging Transportation Infrastructure Assets Through Public-Private Partnership https://rip.trb.org/View/2658058 Fri, 23 Jan 2026 13:43:13 GMT https://rip.trb.org/View/2658058 Quick-Response Research on Long-Term Strategic Issues. Task 56. Student Fare Programs to Increase Ridership https://rip.trb.org/View/2636148 Mon, 08 Dec 2025 20:08:55 GMT https://rip.trb.org/View/2636148 Feasibility Assessment of Family-Friendly Transit Fares https://rip.trb.org/View/2636141 Mon, 08 Dec 2025 20:00:50 GMT https://rip.trb.org/View/2636141 Funding and Financing for Public Transportation at the Local, Regional, and State Levels https://rip.trb.org/View/2636145 Mon, 08 Dec 2025 19:55:17 GMT https://rip.trb.org/View/2636145 Synthesis of Information Related to Highway Practices. Topic 57-14. Practices Related to Cost Estimating for Early Project Development Phases https://rip.trb.org/View/2630497 Tue, 25 Nov 2025 16:09:40 GMT https://rip.trb.org/View/2630497 Analyzing the accessibility to safe and connected biking infrastructure facilities: an equity perspective https://rip.trb.org/View/2626987 Wed, 19 Nov 2025 15:13:44 GMT https://rip.trb.org/View/2626987 Synthesis of Information Related to Airport Practices. Topic S01-33. Practices for Determining Landing Fees at General Aviation Airports https://rip.trb.org/View/2621998 Mon, 10 Nov 2025 19:25:41 GMT https://rip.trb.org/View/2621998 A Guide for Advancing Weather-Resilient Infrastructure Investment in Airports https://rip.trb.org/View/2588323 Tue, 12 Aug 2025 10:09:36 GMT https://rip.trb.org/View/2588323