DAYTIME RUNNING LIGHTS PROJECT. IV: TWO-LANE PASSING PERFORMANCE AS A FUNCTION OF HEADLIGHT INTENSITY AND AMBIENT ILLUMINATION

Authors
  1. Attwood, D.A.
Corporate Authors
Department of Transport, Toronto ONT (CAN) Road Safety Unit;Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The experiment investigated the ability of subject drivers to perform a two-lane passing task, with oncoming traffic, as a function of the level of ambient illumination and the headlight intensity of the oncoming vehicle. Eight experienced drivers performed both passing trials and gap-estimation trials, under closed-course conditions, during dawn and dusk hours. Levels of ambient illumination varied from approximately .02 to 200 ft-c during the experiments. Headlight conditions included no lights, normal low-beam headlights and low-beams with filters which reduced their intensity to about 1/3 of normal. Results indicated that the gaps accepted by drivers in a two-lane passing situation increased with an increase in the intensity of the headlight of the oncoming vehicle. The range of gaps accepted across headlight conditions was less, however, at higher levels of ambient illumination than at lower levels. TRUNCATED
Report Number
RSU-76/1 — Technical Report
Date of publication
15 Feb 1976
Number of Pages
49
DSTKIM No
88-00594
CANDIS No
53836
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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