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/ Traffic Speed Effects on Highway Safety Manual Crash Prediction Models https://rip.trb.org/View/2558395 Wed, 28 May 2025 10:16:59 GMT https://rip.trb.org/View/2558395 Analysis of Contributing Factors in Crashes Involving Electric Vehicles and Vehicles with Automated Features https://rip.trb.org/View/2440011 Sat, 12 Oct 2024 12:00:58 GMT https://rip.trb.org/View/2440011 The Role of Built Environment Factors in Enhancing Pedestrian and Bicycle Safety: A Comprehensive Analysis and Policy Implications https://rip.trb.org/View/2401750 Mon, 08 Jul 2024 14:54:15 GMT https://rip.trb.org/View/2401750 Pedestrian Fatalities & Injuries in Hit-and-Run Crashes in California, Tennessee & the US: Recent Trends and Risk Factors https://rip.trb.org/View/2401742 Mon, 08 Jul 2024 14:54:10 GMT https://rip.trb.org/View/2401742 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 Safe System Approach for Including Trees in Urban and Suburban Roadway Contexts https://rip.trb.org/View/2381741 Wed, 22 May 2024 11:59:20 GMT https://rip.trb.org/View/2381741 Estimating the Effects of Vehicle Automation and Vehicle Weight and Size on Crash Frequency and Severity: Phase 1 https://rip.trb.org/View/2292646 Mon, 20 Nov 2023 20:20:46 GMT https://rip.trb.org/View/2292646 Urban Demographic Shift of Pedestrian and Bicyclist Collisions, Equity, and Police Enforcement https://rip.trb.org/View/2232673 Wed, 23 Aug 2023 20:51:48 GMT https://rip.trb.org/View/2232673 Creating a Data Resource of California Police Stops for Use in Traffic Safety Applications https://rip.trb.org/View/2229363 Thu, 17 Aug 2023 08:10:43 GMT https://rip.trb.org/View/2229363 Subdural Hematoma Injury Risk Curve Development for Older Occupants https://rip.trb.org/View/2050298 Tue, 25 Oct 2022 10:24:48 GMT https://rip.trb.org/View/2050298 Incorporating Driver Behavior and Characteristics into Safety Prediction Methods https://rip.trb.org/View/1996243 Tue, 19 Jul 2022 14:24:47 GMT https://rip.trb.org/View/1996243 Impact of Autonomous Vehicle (AV)-Based on Demand Transportation Services on Traffic Crashes https://rip.trb.org/View/1948953 Mon, 09 May 2022 11:04:06 GMT https://rip.trb.org/View/1948953 Impact of COVID-19 Pandemic on Road Safety in Region 6 https://rip.trb.org/View/1948658 Fri, 06 May 2022 15:53:55 GMT https://rip.trb.org/View/1948658 COVID-19 and Traffic Safety: Role of Infrastructure and Exposure https://rip.trb.org/View/1904961 Thu, 20 Jan 2022 14:38:30 GMT https://rip.trb.org/View/1904961 Effectiveness of Safety Countermeasures on Dockless E-Scooter Crashes https://rip.trb.org/View/1881795 Mon, 04 Oct 2021 11:42:19 GMT https://rip.trb.org/View/1881795