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/ Vision and Roadmap for the Next Generation of the Highway Capacity Manual https://rip.trb.org/View/2558383 Wed, 28 May 2025 14:08:54 GMT https://rip.trb.org/View/2558383 Estimating HCM Default Parameters for Louisiana https://rip.trb.org/View/2096075 Mon, 09 Jan 2023 10:45:38 GMT https://rip.trb.org/View/2096075 Assessing and Addressing Deficiencies in the HCM Weaving Segment Analyses – Project J5 (Phase II of Project K2) https://rip.trb.org/View/1861674 Fri, 25 Jun 2021 21:11:58 GMT https://rip.trb.org/View/1861674 Development of Florida Traffic Characteristics for Service Volume Calculations Based on Latest HCM https://rip.trb.org/View/1664477 Tue, 05 Nov 2019 10:55:24 GMT https://rip.trb.org/View/1664477 Reliability and Quality of Service Evaluation Methods for Rural Highways https://rip.trb.org/View/1628600 Sat, 08 Jun 2019 10:04:39 GMT https://rip.trb.org/View/1628600 Two-lane highway analysis methodology enhancements considering commercial trucks https://rip.trb.org/View/1552818 Wed, 03 Oct 2018 15:19:28 GMT https://rip.trb.org/View/1552818 Enhancement of Transportation Network Analysis Tools for Truck-related Planning and Operations https://rip.trb.org/View/1531750 Sat, 11 Aug 2018 21:46:25 GMT https://rip.trb.org/View/1531750 Update of Highway Capacity Manual: Merge, Diverge, and Weaving Methodologies https://rip.trb.org/View/1516154 Mon, 18 Jun 2018 19:25:48 GMT https://rip.trb.org/View/1516154 Evaluating the Performance of Right-Turn-On-Red Operation at Signalized Intersections (with single and dual right-turn lanes) https://rip.trb.org/View/1513308 Mon, 21 May 2018 21:42:30 GMT https://rip.trb.org/View/1513308 HRDO-FY16-06 Narrowing Freeway Lanes and Shoulders to Create Additional Travel Lanes https://rip.trb.org/View/1509484 Tue, 24 Apr 2018 14:26:26 GMT https://rip.trb.org/View/1509484 Analysis of Oversaturated Traffic Flow Conditions on Freeway Facilities https://rip.trb.org/View/1492248 Tue, 19 Dec 2017 15:16:14 GMT https://rip.trb.org/View/1492248 Phase II - Using Capacity Adjustments for Connected and Autonomous Based on Various Market Penetration Rates for Long Range Planning and Scenario Analysis https://rip.trb.org/View/1475617 Sun, 23 Jul 2017 14:54:04 GMT https://rip.trb.org/View/1475617 NCLOS Program Update for the HCM 6th Edition https://rip.trb.org/View/1424437 Mon, 26 Sep 2016 14:04:15 GMT https://rip.trb.org/View/1424437 Operational Performance and Safety Effects of Arterial Weaving Sections https://rip.trb.org/View/1407199 Thu, 12 May 2016 13:43:50 GMT https://rip.trb.org/View/1407199