Transport Research International Documentation (TRID) https://trid.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) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ A REVIEW OF RAILWAY LEVEL CROSSINGS IN RELATION TO ROAD SAFETY, OCTOBER 1971. https://trid.trb.org/View/544664 Thu, 29 Sep 1994 00:00:00 GMT https://trid.trb.org/View/544664 A REVIEW OF RAILWAY LEVEL CROSSINGS IN RELATION TO ROAD SAFETY https://trid.trb.org/View/38228 Fri, 05 Nov 1976 00:00:00 GMT https://trid.trb.org/View/38228