Consideration about the relation of headlamp glare and driving visibility.

Author(s)
Shinkai, H. & Osumi, Y.
Year
Abstract

FOR NIGHT DRIVING WITH ONLY THE USE OF LOW BEAM HEADLAMPS, PHOTOMETRIC IMPROVEMENT OF THE LOW BEAM IS CONSIDERED TO BE NECESSARY TO IMPROVE DRIVING VISIBILITY. MOST DRIVERS WISH TO HAVE IMPROVED FAR DISTANCE LOW BEAM, WHILE THEY DEMAND NO DAZZLING LIGHT DISTRIBUTION FROM OPPOSING CARS. A MEANS TO SEE FAR AHEAD IS TO INCREASE LAMP INTENSITY OR TO HAVE AN UPWARD LIGHTING BEAM. IN THE LATTER CASE THE ROAD SURFACE NEAR THE VEHICLE BECOMES DARK. FOR THAT REASON AN INCREASE IN LAMP INTENSITY IS SELECTED IN ORDER TO SEE FAR AHEAD. BUT, AS WE KNOW, IT IS THE GLARE THAT AFFECTS DRIVER'S VISIBILITY WHICH CAUSES INCREASED SERIOUS PROBLEMS. THE THRESHOLD LEVEL OF GLARE IS EXAMINED BASED ON FIELD TESTS FINDING A TOLERABLE LEVEL OF DISCOMFORT DUE TO DAZZLING AND TARGET VISIBILITY. INCREASE IN VISIBILITY DISTANCE IS EXAMINED, WHEN THE HEADLAMP INTENSITY IS INCREASED TO THE THRESHOLD LEVEL OF GLARE. FOR THE COVERING ABSTRACT OF THE CONFERENCE SEE IRRD 802816.

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Publication

Library number
C 51629 (In: B 23221 [electronic version only]) /91 / IRRD 802902
Source

In: Ninth International Technical Conference on Experimental Safety Vehicles held at Kyoto, Japan, November 1-4 1982, p. 885-889

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