LOW-BEAM HEADLAMP ILLUMINATION AT VERY HIGH ANGLES

Information about headlamp illumination at high angles is important for assessing visibility of overhead retroreflective traffic signs at near distances and veiling luminance caused by scatter in inclement weather such as fog. This study was designed to provide photometric information for very high angles for a sample of U.S. low beams of recent vintage. The sample included 24 pairs of left and right lamps for 1999 and 2000 model year vehicles. The lamps were photometered in 0.2 deg steps from 10 deg up to 90 deg up, and from 60 deg left to 60 deg right. The report documents both the median and maximum luminous intensities at each test point.

• Supplemental Notes:
  • This research was sponsored by the University of Michigan Industry Affiliation Program for Human Factors in Transportation Safety.
• Corporate Authors:

  University of Michigan Transportation Research Institute

  2901 Baxter Road
  Ann Arbor, MI  United States  48109-2150
• Authors:
  • Sivak, M
  • Schoettle, B
  • Flannagan, M J
• Publication Date: 2002-11

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Angle of incidence; Fog; Low beamed headlamps; Luminous intensity; Overhead traffic signs; Photometry; Retroreflectivity; Visibility
• Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00975864
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: UMTRI-2002-33,, HS-043 631
• Files: HSL, TRIS, USDOT
• Created Date: Jul 13 2004 12:00AM