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Lighting Research and Technology
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Driver decision making in response to peripheral moving targets under mesopic light levels

Yukio Akashi, PhD

M S Rea, PhD

J D Bullough, PhD

Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY, USA

A field study was conducted to extend fundamental findings about visual performance at mesopic light levels to a driving context. Subjects participating in this field study drove a vehicle along a lighted street while performing a high-order decision-making task. Subjects identified the direction of an off-axis target, toward or away from the street, and braked or accelerated, accordingly. Two sets of light sources were compared: a set of ceramic metal halide light sources and a set of high-pressure sodium light sources. The same study was also performed during the day-time. The results demonstrated that both braking and acceleration response times decreased monotonically as unified luminance increased, suggesting that unified luminance is a suitable rectifying variable for characterizing light levels for different light sources with respect to a complex visual task.

Lighting Research and Technology, Vol. 39, No. 1, 53-67 (2007)
DOI: 10.1177/1365782806071608
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