DAYTIME RUNNING LIGHTS PROJECT. II: VEHICLE DETECTION AS A FUNCTION OF HEADLIGHT USE AND AMBIENT ILLUMINATION

Authors
  1. Attwood, D.A.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Department of Transport, Toronto ONT (CAN) Road Safety Unit
Abstract
The study investigated the ability of subject drivers to detect oncoming vehicles with their low beam headlights "on" and "off" under various levels of daytime illumination. Results indicated that the study vehicles could be detected sooner with their headlights "on" than with their headlights "off". Detection distance in the "lights-on" condition was essentially constant over the range of illumination investigated. In the "lights-off" condition, detection distance decreased, in an approximate linear fashion, with a decrease in the logarithm of ambient illumination. Results are discussed in terms of passing performance on two-lane highways, and in terms of the design of appropriate daytime running lights.
Report Number
TR-RSU-75/2 —
Date of publication
15 Apr 1975
Number of Pages
20
DSTKIM No
83-03752
CANDIS No
80719
Format(s):
Hardcopy;Originator's fiche received by DSIS

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