TRB Publications Indexhttp://pubsindex.trb.org/en-usCopyright © 2015. National Academy of Sciences. All rights reserved.http://blogs.law.harvard.edu/tech/rsstris-trb@nas.edu (Bill McLeod)tris-trb@nas.edu (Bill McLeod)TRB Publications Indexhttp://pubsindex.trb.org/Images/PageHeader-wTitle.pnghttp://pubsindex.trb.org/TOWARD MORE EFFECTIVE GRADE-CROSSING FLASHING LIGHTShttp://pubsindex.trb.org/view/45711Sat, 04 Sep 1976 00:00:00 GMThttp://pubsindex.trb.org/view/45711