@article{ref1,
title="The Use and Misuse of Traffic Signs",
journal="Traffic quarterly",
year="1961",
author="Darrell, JEP",
volume="15",
number="4",
pages="653-663",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0041-0713",
doi="",
url="http://dx.doi.org/"
}