@article{ref1,
title="Cost Effectiveness of Urban Traffic Law Enforcement",
journal="Journal of transport economics and policy",
year="1973",
author="Shoup, DC",
volume="7",
number="1",
pages="32-57",
abstract="In an experiment conducted by the Los Angeles Police Department, changes in numbers of motorcycle patrols showed no clear net benefit, but accidents were reduced when warnings only were issued to offenders.<p />",
language="",
issn="0022-5258",
doi="",
url="http://dx.doi.org/"
}