Citation

Sivak M, Flannagan MJ, Sato T, Traube EC, Aoki M. Proc. Int. Tech. Conf. Enhanced Safety Vehicles 1995; 1995: 1497-1500.

Copyright

(Copyright © 1995, In public domain, Publisher National Highway Traffic Safety Administration)

DOI

unavailable

PMID

unavailable

Abstract

This study evaluated reaction times to brake signals from standard incandescent brake lamps and from three alternative brake lamps with substantially faster rise times: neon, LED, and fast incandescent. The study, performed in a laboratory, simulated a daytime driving condition. The subject's task was to respond as quickly as possible to the onset of either of two brake lamps in the visual periphery, while engaged in a central tracking task. Brake signals were presented at two levels of luminous intensity. The results showed that reaction times to the alternative brake lamps were faster than to the standard incandescent lamp. The advantage averaged 166 ms for the LED and neon lamps (corresponding to a reduction of 4.6 m in effective stopping distance from 100 km/hr), and 135 ms for the fast incandescent lamp (corresponding to a reduction of 3.8 m in effective stopping distance from 100 km/hr).