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/ Acoustic Effectiveness of Vinyl Fence Noise Walls https://rip.trb.org/View/1762184 Wed, 06 Jan 2021 11:45:43 GMT https://rip.trb.org/View/1762184 Acoustical Model for Mach Cut-off Flight https://rip.trb.org/View/1549345 Fri, 21 Sep 2018 18:22:03 GMT https://rip.trb.org/View/1549345 Great Plains Acoustic Test Facility https://rip.trb.org/View/1228242 Thu, 03 Jan 2013 13:17:16 GMT https://rip.trb.org/View/1228242