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/ ACRP Insight Event: General Aviation Financial Sustainability https://rip.trb.org/View/2772549 Wed, 02 Sep 2026 16:48:14 GMT https://rip.trb.org/View/2772549 Monitoring and Speciation of Particulate Matter Under 2.5 Microns (PM2.5) Composition across Texas Counties https://rip.trb.org/View/2593191 Tue, 26 Aug 2025 12:42:34 GMT https://rip.trb.org/View/2593191 Guide to Analyzing Economic Impact of Changes in Air Service Connectivity https://rip.trb.org/View/2588337 Tue, 12 Aug 2025 09:53:38 GMT https://rip.trb.org/View/2588337 Megaregional Traffic Impact of COVID-19 Pandemic: Analysis of Activity Restriction https://rip.trb.org/View/1878376 Thu, 16 Sep 2021 16:56:36 GMT https://rip.trb.org/View/1878376 Robustness of Transportation Networks under Megaregion Evacuations https://rip.trb.org/View/1517662 Fri, 29 Jun 2018 15:23:08 GMT https://rip.trb.org/View/1517662 Regional Comparative Advantage for Woody Biofuels Production https://rip.trb.org/View/1368830 Tue, 15 Sep 2015 09:53:12 GMT https://rip.trb.org/View/1368830 Studying the Effects of Aircraft Exhaust on Global and Regional Climate https://rip.trb.org/View/1363057 Sat, 25 Jul 2015 01:00:36 GMT https://rip.trb.org/View/1363057