A SUBSTITUTE FOR ROAD TESTS OF AUTOMOBILE HEADLIGHTS
A METHOD OF COMPARING VEHICLE HEADLIGHTS IS DESCRIBED IN WHICH THE OPINIONS OF DRIVERS ARE OBTAINED UNDER CONTROLLED CONDITIONS ON A TEST TRACK. THE METHOD IS INTENDED BOTH TO SUPPLEMENT THE USUAL TESTS IN WHICH THE DISTANCES AT WHICH OBJECTS ARE RECOGNIZED ARE DETERMINED AND TO REPLACE ROAD TRIALS, WHERE MANY CONDITIONS ARE UNCONTROLLED. TESTS WITH HEADLAMPS PROVIDING PASSING BEAMS OF FOUR DIFFERENT TYPES ARE ALSO DESCRIBED. ON BOTH WET AND DRY ROADS, A PAIR OF NEW BRITISH TWIN-DIPPING HEADLAMPS WAS PREFERRED TO OTHER LAMPS TESTED, ALTHOUGH A PAIR OF LAMPS OF A CONTINENTAL MAKE WAS ALMOST AS WELL LIKED. ASSESSMENTS OF GLARE INDICATED THAT IT WAS JUDGED TO BE HIGHER ON WET ROADS THAN ON DRY ONES, AND THAT A GLARING INTENSITY OF 400 TO 500 CANDELAS FROM EACH OF THE HEADLAMPS WAS EASILY TOLERATED ON DRY ROADS. SUGGESTIONS ARE MADE FOR FURTHER INVESTIGATIONS OF GLARE ON DRY AND WET ROADS. /AUTHOR/
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Supplemental Notes:
- No 89, pp 1-6, 4 FIG, 2 TAB, 8 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Grime, Geoffrey
- Publication Date: 1954
Media Info
- Media Type: Digital/other
- Monograph Title: Night visibility
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Serial:
- Highway Research Board Bulletin
- Issue Number: 89
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Glare; Headlamps; Low beamed headlamps; Moisture content; Road tests; Test tracks; Vehicle lighting
- Uncontrolled Terms: Wet conditions
- Old TRIS Terms: Control conditions; Low beamed headlights
- Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00220410
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Apr 21 1994 12:00AM