HOW DOES THE PERFORMANCE OF TRAFFIC LIGHT SIGNALS CHANGE. LONG-TERM PERFORMANCE IN DIFFERENT TRAFFIC ENVIRONMENTS. FINAL REPORT

HUR FOERAENDRAS TRAFIKSIGNALER I DRIFT. EFFEKTER AV DRIFTSTID I OLIKA TRAFIKMILJOEER. SLUTRAPPORT

Ten traffic signals of three different makes (i.e. 30 signals) were studied with respect to changes after five years of exposure to 'hard' and 'soft' traffic environments in Gothenburg. For each of the 30 signals, the red, yellow and green colors of the signal light were determined and the light distribution of the red signal was measured when the signals were new. These measurements were then repeated after five years of exposure in traffic. The results from these two series of measurement were then compared. Furthermore, each spring a simple relative 'measurement of light level' was carried out on each traffic signal in the traffic environment. The signal was first measured with a dirty lens and then when the lens had been cleaned manually.

• Supplemental Notes:
  • Prepared in cooperation with Statens Provningsanstalt, Boras, Sweden.
• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Helmers, G
  • WERNER, G
• Publication Date: 1992

Language

• Swedish

Media Info

• Pagination: 148 p.

Subject/Index Terms

• TRT Terms: Age; Color; Evaluation; Navigation lights; Performance; Time duration; Traffic signals
• Uncontrolled Terms: Age factors; Long term
• Old TRIS Terms: Light signals; Traffic signal effectiveness
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00628027
• Record Type: Publication
• Report/Paper Numbers: VTI-373
• Files: TRIS
• Created Date: Dec 4 1993 12:00AM