THE LIGHT REQUIREMENTS OF TRAFFIC SIGNALS

The requirements for colour and intensity of light signals for controlling traffic are discussed. Colour (red, green and amber) must cater for drivers with abnormal colour vision. Research has indicated an intensity of 200 cd for a red signal viewed against the sky, increasing to 600 cd under high-speed situations. Blackboards behind signals improve viewing where there is a bright sky. (A). /TRRL/

• Corporate Authors:

  Thomson Publications (Australia) Pty Limited

  47 Chippen Street
  Chippendale, New South Wales 2008,   Australia 
• Authors:
  • FISHER, A J
• Publication Date: 1975-4

Language

• English

Media Info

• Pagination: p. 43-44
• Serial:
  • IES Lighting Review
  • Volume: 37
  • Publisher: Thomson Publications (Australia) Pty Limited

Subject/Index Terms

• TRT Terms: Amber; Color; Drivers; Green; Green interval; Luminous intensity; Motor vehicles; Red; Red clearance interval; Speed; Traffic control; Traffic signals; Traffic speed; Vision; Yellow; Yellow change interval
• Uncontrolled Terms: Intensity
• Old TRIS Terms: Driver vision
• ITRD Terms: 559: Amber light; 6784: Colour; 1772: Driver; 9026: Green; 505: Light intensity; 9068: Red; 5408: Speed; 565: Traffic signal; 2066: Vision
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control;

Filing Info

• Accession Number: 00164245
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 14 1978 12:00AM