@article{ref1,
title="Field evaluation of the gamma scientific model 910b retroreflectometer",
journal="Transportation research record",
year="1979",
author="Malasheskie, Gerald J. and O'Block, Frank W.",
volume="713",
number="",
pages="19-23",
abstract="A retroreflectometer designed for use in the field was tested for performance, durability, and ease of operations under conditions of: temperature ranges of 0-38 degrees C (32-100 degrees F), low and high relative humidity, and both bright sunlight and cloudy lighting conditions. Measurements taken with it were compared with those done by D retroreflectometer used in the laboratory. Varying environmental conditions of lighting, temperature, and relative humidity found in Pennsylvania did not adversely affect the performance of the device. As a result, it will be used by the Pennsylvania DOT to measure the initial specific luminance values of sheeting materials for compliance with its specification for sheet-reflective materials and to determine when highway signs should be replaced.<p />",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}