@article{ref1,
title="Flattening of Horizontal Curves on Rural Two-Lane Highways",
journal="Journal of transportation engineering",
year="1990",
author="Lin, Feng-Bor",
volume="116",
number="2",
pages="181-196",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0733-947X",
doi="",
url="http://dx.doi.org/"
}