VEHICLE HEADLIGHTS

Vehicle headlights have been important in road safety since motoring began. Headlamp development has been chefly concerned with improving the dipped beam; today's headlamps are optically and mechanically refined but in basic principles have remained the same for several decades. Two different beam patterns have evolved; performance even under ideal conditions is inadequate and in practice it is far below the ideal. The optimum vehicle lighting for lit roads is now recognized to be a large area lamp with intensity intermediate between sidelights and present dipped headlights. Various proposals are discussed. For unlit roads in the long term conventional systems will have to give way to new techniques such as polarization or the adoption of variable beam systems responsive to the changing road scene ahead. /Author/TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00243426
• Corporate Authors:

  Illuminating Engineering Society

  York House, 199 Westminster Bridge Road
  London SE1 7UN,   England 
• Authors:
  • YERRELL, J S
• Publication Date: 1976

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 69-79
• Serial:
  • Lighting Research and Technology
  • Volume: 8
  • Issue Number: 2
  • Publisher: Sage Publications Limited
  • ISSN: 1477-1535
  • Serial URL: http://lrt.sagepub.com/

Subject/Index Terms

• TRT Terms: Headlamps; Low beamed headlamps; Street lighting; Vehicle lighting
• Old TRIS Terms: Low beamed headlights
• ITRD Terms: 1057: Air transport network; 6737: Beam (ray); 1340: Dipped headlight; 5910: Durability; 1677: Glare; 1342: Headlamp; 1341: Headlamp setting; 6226: In situ; 505: Light intensity; 545: Lighting (street); 9052: Night; 6764: Optics; 6796: Polarization; 1665: Safety; 8103: South Africa; 6255: Test
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00157785
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Dec 8 1977 12:00AM