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/ Highway Safety Manual Crash Prediction Models of Arterial Weaving Segments https://rip.trb.org/View/2712176 Tue, 09 Jun 2026 14:53:30 GMT https://rip.trb.org/View/2712176 Calibration and Implementation of Highway Safety Manual Bicyclist and Pedestrian Intersection Crash Prediction Models https://rip.trb.org/View/2635921 Thu, 04 Dec 2025 08:52:41 GMT https://rip.trb.org/View/2635921 Validation of HSM Crash Prediction Methods for Specific Intersection Types in Oregon https://rip.trb.org/View/2593954 Thu, 28 Aug 2025 12:53:55 GMT https://rip.trb.org/View/2593954 Applying Crash Prediction Models Across Traffic Control and Facility Types https://rip.trb.org/View/2558381 Wed, 28 May 2025 14:12:45 GMT https://rip.trb.org/View/2558381 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 Updated Calibration Factors for Highway Safety Manual Crash Prediction Models (2020-2023) https://rip.trb.org/View/2536232 Fri, 11 Apr 2025 01:36:13 GMT https://rip.trb.org/View/2536232 Training Program to Apply Quantitative Highway Safety Analysis Methods https://rip.trb.org/View/2381750 Thu, 23 May 2024 10:14:00 GMT https://rip.trb.org/View/2381750 Imagery Reference Illustrating Data Elements for Crash Prediction Methodology https://rip.trb.org/View/2381752 Thu, 23 May 2024 10:02:54 GMT https://rip.trb.org/View/2381752 Crash Prediction Methods for Long-Term Work Zones https://rip.trb.org/View/2381735 Tue, 21 May 2024 20:29:15 GMT https://rip.trb.org/View/2381735 Crash Prediction Models for Alternative and Unconventional Intersections https://rip.trb.org/View/2219017 Tue, 25 Jul 2023 08:12:26 GMT https://rip.trb.org/View/2219017 Network Screening on Low-Volume Roads: Empirical Validation of a New Proposed Methodology https://rip.trb.org/View/2170310 Fri, 12 May 2023 15:48:53 GMT https://rip.trb.org/View/2170310 Highway Safety Manual 2nd Edition (HSM2) Implementation https://rip.trb.org/View/2169804 Wed, 10 May 2023 16:49:53 GMT https://rip.trb.org/View/2169804 Enhancement of Roadside Design Safety Prediction Models for the Highway Safety Manual https://rip.trb.org/View/1854201 Thu, 27 May 2021 19:30:01 GMT https://rip.trb.org/View/1854201 RES2016-27: Highway Safety Manual Safety Performance Functions & Roadway Calibration Factors: Roadway Segments https://rip.trb.org/View/1767387 Thu, 04 Feb 2021 14:40:22 GMT https://rip.trb.org/View/1767387 Calibration Factors for Safety Performance Functions https://rip.trb.org/View/1743195 Mon, 05 Oct 2020 16:31:44 GMT https://rip.trb.org/View/1743195