@article{ref1,
title="Ridesharing and motor vehicle crashes in four U.S. cities: an interrupted time series analysis",
journal="American journal of epidemiology",
year="2018",
author="Morrison, Christopher N. and Jacoby, Sara F. and Dong, Beidi and Delgado, M. Kit and Wiebe, Douglas J.",
volume="187",
number="2",
pages="224-232",
abstract="Uber, the world's largest ridesharing company, has reportedly provided over two billion journeys globally since operations began in 2010; however, the impact on motor vehicle crashes is unclear. Theoretically, ridesharing could reduce alcohol-involved crashes in locations where other modes of transportation are less attractive than driving one's own vehicle while alcohol-affected. We conducted interrupted time series analyses using weekly counts of injury crashes and the proportion that were alcohol-involved in four US cities (Las Vegas, NV; Portland, OR; Reno, NV; San Antonio, TX). We considered that a resumption of Uber operations after a temporary break would produce a more substantial change in ridership than an initial launch, so we selected cities where Uber launched, ceased, and then resumed operations (2013-2016). We hypothesized that Uber's resumption would be associated with fewer alcohol-involved crashes. <br><br>RESULTS partially supported this hypothesis. For example, in Portland, Uber's resumption was associated with a 61.8% reduction (95% confidence interval = 38.7%, 86.4%) in the alcohol-involved crash rate (an absolute decrease of 3.1 [95% confidence interval = 1.7, 4.4] alcohol-involved crashes per week); however there was no concomitant change in all injury crashes. Relationships between ridesharing and motor vehicle crashes differ between cities over time, and may depend on specific local characteristics.<br><br>© The Author(s) 2017. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.<p /> <p>Language: en</p>",
language="en",
issn="0002-9262",
doi="10.1093/aje/kwx233",
url="http://dx.doi.org/10.1093/aje/kwx233"
}