IMPROVEMENT IN THE DAY AND NIGHT VISIBILITY OF SIGNALLING DEVICES. APPLICATIONS OF PHOTOMETRY AND COLORIMETRY

AMELIORATION DE LA VISIBILITE DE LA SIGNALISATION ROUTIERE DE JOUR ET DE NUIT - APPLICATIONS DE LA PHOTOMETRIE ET DE LA COLORIMETRIE

This study comes within the scope of the research described in research project IRRD 500733. Its aim is to widen the knowledge of the efficiency of signalling devices thanks to a better approach to their photometric and colorimetric properties. It deals with traffic signals and reflecting devices. Measurements were made of the light intensity, colour and ghosting effect of the different types of traffic signals used in France. Based on a bibliographic analysis of the visual efficiency of traffic signals and a comparison of measurement results with draft recommendations by the CIE (International Commission for Lighting), elements are proposed for the drafting of future standards. A measuring method was developed for determining the variation in the light intensity of flashing lights as a function of time for flashes which last approximately 100 microseconds. It is then possible to calculate their effective light intensity by the Blondel-Rey method. Their colour is defined using the trichromatic coordinates of the filter. Among reflecting devices, a special study was conducted of carriageway markings, reflecting studs and reflectorized films. The values characterizing the photometric and colorimetric properties of this equipment are defined together with methods of measuring them in the laboratory. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00852643
• Corporate Authors:

  Central Laboratory of Bridges & Highways, France

  75732 Paris,   France 
• Authors:
  • Hubert, R
• Publication Date: 1981-6

Language

• French

Media Info

• Features: Figures; References; Tables;
• Pagination: 54 p.
• Serial:
  • Publication of: Central Laboratory of Bridges & Highways, France
  • Publisher: Central Laboratory of Bridges & Highways, France
  • ISSN: 0085-2643

Subject/Index Terms

• TRT Terms: Color; Colorimetry; Filters; Flashing traffic signals; Light; Luminous intensity; Measurement; Night visibility; Photometry; Properties of materials; Reflectorized materials; Research reports; Road marking materials; Road markings; Standardization; Traffic signals; Traffic signs; Visibility
• Uncontrolled Terms: Intensity
• Geographic Terms: France
• Old TRIS Terms: Traffic marking materials
• ITRD Terms: 562: Carriageway marking; 6784: Colour; 514: Flashing light; 505: Light intensity; 6136: Measurement; 6761: Photometry; 5925: Properties; 4523: Reflectorized material; 8559: Research report; 9075: Standardization; 553: Traffic sign; 565: Traffic signal; 6783: Visibility
• Subject Areas: Geotechnology; Highways; Materials; Operations and Traffic Management; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 00361267
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Report/Paper Numbers: No. 102 Monograph
• Files: ITRD, TRIS
• Created Date: Jul 30 1982 12:00AM