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/ Effect of Using RAP on Gravel Roads https://rip.trb.org/View/2720399 Tue, 30 Jun 2026 15:25:11 GMT https://rip.trb.org/View/2720399 Design Requirements for High Traffic Asphalt Mixes to Ensure Pavement Performance https://rip.trb.org/View/2671978 Wed, 18 Feb 2026 11:11:29 GMT https://rip.trb.org/View/2671978 Investigation of Balanced Mixture Design for New York State Asphalt Mixtures https://rip.trb.org/View/1666459 Fri, 24 Jan 2020 15:32:57 GMT https://rip.trb.org/View/1666459 Research for AASHTO Standing Committee on Highways. Task 412. Adjustments to the Superpave Volumetric Mixture Design Procedure for Selecting Optimum Asphalt Content https://rip.trb.org/View/1491277 Mon, 11 Dec 2017 20:09:59 GMT https://rip.trb.org/View/1491277