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/ 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 Conduct Economic Impact Assessment of Transit in Texas https://rip.trb.org/View/2767431 Thu, 27 Aug 2026 11:25:19 GMT https://rip.trb.org/View/2767431 Potential Impact of Autonomous Vehicles on Reducing Congestion - Phase 2 https://rip.trb.org/View/2733194 Wed, 22 Jul 2026 17:37:19 GMT https://rip.trb.org/View/2733194 UAM-enabled Multimodal Analysis of Transportation Systems for LA28 and beyond: Phase 2 https://rip.trb.org/View/2733110 Wed, 22 Jul 2026 17:32:39 GMT https://rip.trb.org/View/2733110 Putting a Price on Regional Rail Quality: Evaluating the Value Potential Riders Place on Regional Rail Service Attributes https://rip.trb.org/View/2702083 Wed, 13 May 2026 16:58:48 GMT https://rip.trb.org/View/2702083 Transit-Oriented Development Ridership Calculator - Phase 1 https://rip.trb.org/View/2697837 Thu, 30 Apr 2026 12:20:39 GMT https://rip.trb.org/View/2697837 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 Accounting for fare evasion in estimates of transit ridership https://rip.trb.org/View/2697836 Wed, 29 Apr 2026 17:26:24 GMT https://rip.trb.org/View/2697836 Lessons Learned on Mobility as a Service (MaaS): Exploring Opportunities and Barriers for the U.S. Context https://rip.trb.org/View/2696846 Tue, 28 Apr 2026 11:03:21 GMT https://rip.trb.org/View/2696846 Passenger Evacuation Experience https://rip.trb.org/View/2694524 Wed, 22 Apr 2026 10:30:31 GMT https://rip.trb.org/View/2694524 Reducing empty miles of shared mobility on highway corridors https://rip.trb.org/View/2691661 Sun, 12 Apr 2026 23:16:30 GMT https://rip.trb.org/View/2691661 Scaling Shared Autonomous Vehicle Services: Adoption, Demand, and System Implications https://rip.trb.org/View/2691658 Sun, 12 Apr 2026 23:06:23 GMT https://rip.trb.org/View/2691658 Naïve Subject Testing – Suite Emergency Passage Features https://rip.trb.org/View/2686617 Wed, 01 Apr 2026 10:17:47 GMT https://rip.trb.org/View/2686617 Identifying Gaps in Transit Infrastructure and Potential Solutions https://rip.trb.org/View/2677556 Wed, 04 Mar 2026 13:33:15 GMT https://rip.trb.org/View/2677556 UAM-enabled Multimodal Analysis of Transportation Systems for LA28 and beyond - Phase 1 https://rip.trb.org/View/2676008 Tue, 03 Mar 2026 16:34:37 GMT https://rip.trb.org/View/2676008