TY  - JOUR
PY  - 2018//
TI  - Ridesharing and motor vehicle crashes in four U.S. cities: an interrupted time series analysis
JO  - American journal of epidemiology
A1  - Morrison, Christopher N.
A1  - Jacoby, Sara F.
A1  - Dong, Beidi
A1  - Delgado, M. Kit
A1  - Wiebe, Douglas J.
SP  - 224
EP  - 232
VL  - 187
IS  - 2
N2  - 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>
LA  - en
SN  - 0002-9262
UR  - http://dx.doi.org/10.1093/aje/kwx233
ID  - ref1
ER  -