@article{ref1,
title="Unified Design of Horizontal Circular Curves -- Closure",
journal="Journal of transportation engineering",
year="1994",
author="Easa, Said M.",
volume="120",
number="4",
pages="687-689",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0733-947X",
doi="",
url="http://dx.doi.org/"
}