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/ Traffic Safety Information Depot https://rip.trb.org/View/1236225 Thu, 03 Jan 2013 15:43:16 GMT https://rip.trb.org/View/1236225 Urban & Suburban Safety Performance Functions (Ph II) https://rip.trb.org/View/1234662 Thu, 03 Jan 2013 15:17:17 GMT https://rip.trb.org/View/1234662