TRAFFIC SIGNALS - SOME MEASUREMENT OF INTENSITY AND VISIBILITY

TRAFIKSIGNALER NAAGRA MAETNINGAR AV LJUSSTYRKA OCH SYNBARHET

Some measurements of the intensity and visibility of traffic signals have been made. Intensity measurements have been made partly in the laboratory on brand new signals, partly in traffic on in-service signals. The visibility of the new signals was studied by means of a subjective estimation method under four conditions: daylight, darkness and extremely low sun, behind and in front of the observers. In the results and the discussion comparisons are made partly between the values of new and the in-service signals and partly between different types of signals. The measurements of intensity and visibility are also analyzed together and visibility is expressed as a function of signal intensity for the various conditions. (A) /TRRL/

• Corporate Authors:

  Swedish Road Safety Office

  Fack S-17120
  Solna 1,   Sweden 
• Authors:
  • DAHLSTEDT, S
• Publication Date: 1975

Language

• Swedish

Media Info

• Features: Figures; References; Tables;
• Pagination: 31 p.

Subject/Index Terms

• TRT Terms: Daylight; Luminous intensity; Measurement; Night; Traffic signals; Visibility
• Uncontrolled Terms: Intensity
• ITRD Terms: 9008: Daylight; 505: Light intensity; 6136: Measurement; 9052: Night; 565: Traffic signal; 6783: Visibility
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 00132317
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: No. 30 R&D Rpt.
• Files: ITRD, TRIS
• Created Date: Jun 23 1976 12:00AM