@article{ref1,
title="Estimating the impacts on ramp-control programs",
journal="Transportation research record",
year="1984",
author="Nihan, Nancy L. and Davis, Gary A.",
volume="957",
number="",
pages="31-32",
abstract="Time-series designs offer flexible, low-cost tools for evaluating transportation improvements. Some preliminary estimates of rampcontrol impacts on an urban freeway are presented.  Record URL:  http://onlinepubs.trb.org/Onlinepubs/trr/1984/957/957-007.pdf<p /><p>Language: en</p>",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}