Pedestrians' estimates of their own nighttime conspicuity are unaffected by severe reductions in headlight illumination.
BACKGROUND
At night pedestrians tend to overestimate their conspicuity to oncoming drivers, but little is known about factors affecting pedestrians' conspicuity estimates. This study examines how headlamp intensity and pedestrians' clothing influence judgments of their own conspicuity.


METHODS
Forty-eight undergraduate students estimated their own conspicuity on an unilluminated closed road by walking in front of a stationary vehicle to the point at which they judged that they were just recognizable to the driver. Unknown to the participants, high beam intensity was manipulated between subjects by placing neutral density filters on the headlamps.


RESULTS
Estimated conspicuity distances did not significantly vary with changes in headlamp intensity even when only 3% of the illumination from the headlamps was present.


CONCLUSIONS
These findings underscore the need to educate pedestrians about the visual challenges that drivers face at night and the need to minimize pedestrians' exposure to traffic flow at night.
Department of Psychology, 418 Brackett Hall, Clemson University, Clemson, SC 29634-1355, USA. Electronic address: sawhets@clemson.edu.
Stephanie A
SA
Whetsel Borzendowski
Rachel L
RL
Rosenberg
Ashley Stafford
AS
Sewall
Richard A
RA
Tyrrell
D000063:Accidents, Traffic / Q000517:prevention & control*; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001334:Automobile Driving; D003020:Clothing; D003624:Darkness; D005260:Female; D006801:Humans; D007600:Judgment; D008029:Lighting / Q000295:instrumentation* / Q000706:statistics & numerical data; D008297:Male; D016138:Walking / Q000523:psychology* / Q000592:standards / Q000706:statistics & numerical data; D055815:Young Adult
Conspicuity; Driving; Headlamps; Night vision; Pedestrians