@article{ref1,
title="Retroreflective requirements for traffic signs: a stop sign case study",
journal="ITE journal",
year="1987",
author="Morales, J.",
volume="57",
number="11",
pages="25-32",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0162-8178",
doi="",
url="http://dx.doi.org/"
}