"A Recommended clearance interval signal indication for protected left turns."; "King, L. Ellis.", "Plummer, Ralph W."; "Traffic signs and signals."; "Plummer, Ralph W.", "King, L. Ellis."; "1973"; "

Pamphlet. \"WVaDH research project, 31.\" On cover: Engineering Experiment Station, West Virginia University. Sponsored by West Virginia Department of Highways in cooperation with U. S. Department of Transportation, Federal Highway Administration.\"

"; ""; "P11931"; "pec"; "Traffic signs and signals."; "14256"; .