@article{ref1,
title="Evaluation of visibility level of retroreflective road signs",
journal="Indian highways",
year="2004",
author="Mohan, S. and Dutta, N. and Bajpai, R.",
volume="",
number="",
pages="-",
abstract="No abstract provided.<p />",
language="",
issn="0376-7256",
doi="",
url="http://dx.doi.org/"
}