@article{ref1,
title="Detection distance in daylight of roof-mounted emergency vehicle lights",
journal="Journal of safety research",
year="1976",
author="Berkhout, J. and Muhler, W",
volume="8",
number="2",
pages="50-58",
abstract="The distance threshold for four visibility in daylight was determined for for flashing incandescent signal systems and for two types of gas discharge tube arrays.  The distance threshold was found to be a function of the physical construction of a lamp housings and the flash pattern as well as of effective intensity.  Certain combinations of internal reflections, glare, and complex flash patterns were found to reduce the overall distance threshold.<p />",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}