@article{ref1,
title="Improving Steep Bends As Hairpin Curves on Mountainous Roads -- Closure",
journal="Journal of transportation engineering",
year="1992",
author="Roy, B. K.",
volume="118",
number="6",
pages="884-888",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0733-947X",
doi="",
url="http://dx.doi.org/"
}