METHODS OF SIGNALIZING LEFT-TURN MOVEMENTS AT CHANNELIZED INTERSECTIONS

THE TYPE OF TRAFFIC SIGNAL INDICATION THAT WILL CONVEY TO A DRIVER THAT HE MAY TURN LEFT BUT THAT HE MUST ALSO YIELD TO OPPOSING TRAFFIC WAS STUDIED. THREE TYPES OF INDICATIONS WERE TESTED: FULL GREEN BALL, FLASHING AMBER BALL, AND FLASHING RED BALL. IT IS CONCLUDED THAT THE FLASHING AMBER INDICATION SHOULD BE USED FOR LEFT-TURNING TRAFFIC DURING 2- PHASE MODE OPERATION AT ANY SIGNALIZED INTERSECTION THAT HAS: (1) EXCLUSIVE LEFT-TURN CHANNELIZATION OF SOME TYPE, (2) MULTIPLE OR LANE CONTROL TYPE SIGNAL INDICATIONS, AND (3) A PERMISSIVE OR DRIVER OPTION LEFT TURN SIGNAL PHASE. /RRL/

• Supplemental Notes:
  • Vol 37, No 8, PP 48-50, 52-54, 5 FIG, 3 TAB
• Authors:
  • Fairfax, B W
• Publication Date: 1967-5

Media Info

• Serial:
  • Traffic Engineering, Inst Traffic Eng

Subject/Index Terms

• TRT Terms: Channelized intersections; Drivers; Flashing traffic signals; Indicators (Instruments); Lane use control signals; Left turns; Opposing traffic; Regulatory signs; Selection and appointment; Traffic signal indications; Traffic signals
• Uncontrolled Terms: Driver selection; Traffic direction
• Old TRIS Terms: Left turn only
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225274
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Mar 19 1971 12:00AM