00599nam 2200157z- 450 9910712787403321(CKB)5470000002496295(EXLCZ)99547000000249629520230509c2019uuuu -u- -engSafety evaluation of pedestrian countdown signalsMcLean, VAU.S. Department. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research CenterBOOK9910712787403321Safety evaluation of pedestrian countdown signals3307294UNINA