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/ Scoping Study: Vertical Visibility Constraints -- Vertical Curvature Traffic Control Devices https://rip.trb.org/View/2709249 Tue, 02 Jun 2026 13:49:43 GMT https://rip.trb.org/View/2709249 Using Head-Mounted Virtual Reality to Measure Dynamic Driver Sight Distances and Blind Spots https://rip.trb.org/View/2625595 Mon, 17 Nov 2025 14:56:41 GMT https://rip.trb.org/View/2625595 Developing a Prototype System for Measuring Intersection Sight Distances https://rip.trb.org/View/2437841 Mon, 07 Oct 2024 16:01:56 GMT https://rip.trb.org/View/2437841 Assessing Pedestrian Sight Distance for Crossing Decisions https://rip.trb.org/View/2381747 Thu, 23 May 2024 10:06:12 GMT https://rip.trb.org/View/2381747 Developing sight distance guidelines for U-turn maneuvers https://rip.trb.org/View/2339986 Thu, 15 Feb 2024 14:41:43 GMT https://rip.trb.org/View/2339986 Update of the Policy on Geometric Design of Highways and Streets Guidance on Acceleration/Deceleration and Stopping Sight Distance Criteria https://rip.trb.org/View/1628617 Sat, 08 Jun 2019 05:14:54 GMT https://rip.trb.org/View/1628617 Comprehensive Driver Behavior Assessment under Restricted Intersection Sight Distance https://rip.trb.org/View/1229825 Thu, 03 Jan 2013 13:49:16 GMT https://rip.trb.org/View/1229825