Optimal Strategies for Adaptive Curve Lighting

In order to improve illumination for nighttime visibility on curves, several curve-lighting strategies have been proposed that involve moving one or both low beam headlamps by various amounts. This paper reports on a recent analytical study that evaluated the advantages and disadvantages of these curve-lighting strategies. Two curve radii were examined for both curve directions, using representative tungsten-halogen and high-intensity discharge low-beam patterns. The dependent variable was the maximum distance of 3-lux illumination (combined from both lamps) at a plane 0.25 m above the roadway for seven lateral positions. Results showed that for short-radius, left and right curves, moving both lamps in parallel should substantially increase the visibility of objects in the driver's lane of travel, in several additional lanes of travel to the left and right, and off the road. For large-radius curves, the best strategy depended on the curve direction, beam pattern and lateral position in the visual field. There were performance trade-offs between left and right lateral positions, with improvements in one lateral area generally being paired with decrements in the other. Additional research is needed to better understand the desirable approach for large-radius curves and to explore the benefits of asymmetric shifts for left and right curves.

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  • Authors:
    • Sivak, Michael
    • Schoettle, Brandon
    • Flannagan, Michael J
    • Minoda, Takako
  • Publication Date: 2005


  • English

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Filing Info

  • Accession Number: 01003805
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 3 2005 7:11PM