TY - BOOK ID - 136914771 TI - Rectangular rapid flash beacon (RRFB) PY - 2009 PB - [Washington, D.C.] : U.S. Dept. of Transportation, Federal Highway Administration, DB - UniCat KW - Roads KW - Traffic signs and signals KW - Pedestrian crosswalks KW - Interchanges and intersections KW - Safety measures. UR - https://www.unicat.be/uniCat?func=search&query=sysid:136914771 AB - ER -