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/ Research for the AASHTO Standing Committee on Planning. Task 68. Implications of New 8-Hour Control Strategy Development on Transportation Programs, Policies, and Projects https://rip.trb.org/View/2706279 Wed, 27 May 2026 14:52:17 GMT https://rip.trb.org/View/2706279 Emissions & Performance of Alternative Vehicles in Northern Climates https://rip.trb.org/View/1359769 Thu, 02 Jul 2015 01:01:20 GMT https://rip.trb.org/View/1359769 Research for the AASHTO Standing Committee on Planning. Task 38. Supplemental Evaluation in Support of NCHRP 25-17 https://rip.trb.org/View/1346921 Thu, 19 Mar 2015 01:02:01 GMT https://rip.trb.org/View/1346921 Improving the Prediction Capabilities of Aftertreatment Models to Meet Future Emission Regulations https://rip.trb.org/View/1228387 Thu, 03 Jan 2013 13:20:04 GMT https://rip.trb.org/View/1228387