@article{ref1,
title="Message signs reduce road's collision rates",
journal="American city and county",
year="2001",
author="",
volume="116",
number="12",
pages="16-17",
abstract="Caltrans District 02 used variable message signs along a 30 mile section of Interstate 5 in Sacramento as a means to reduce accidents.<p />",
language="",
issn="0149-337X",
doi="",
url="http://dx.doi.org/"
}