@article{ref1,
title="Headlight ring retroreflectors",
journal="Australian journal of optometry",
year="1968",
author="Allen, Merrill J.",
volume="51",
number="3",
pages="63-65",
abstract="Retroreflective rings that fit around the headlight were tested in a highway meeting situation to determine the range at which they permitted identification of a single headlight as that of an automobile with a burned-out headlight. As much as a 7 5x increase in identification range with the ring reflectors compared to without was noted. Identification ranges without reflectors were 88 and 177 feet. With reflectors the ranges were from 430 to 680 feet, depending upon the number and size of rings. It is concluded that the rings are effective and help solve one of the hazards of a burned-out headlight.<p /><p>Language: en</p>",
language="en",
issn="0045-0642",
doi="10.1111/j.1444-0938.1968.tb00503.x",
url="http://dx.doi.org/10.1111/j.1444-0938.1968.tb00503.x"
}