The advent of ride-sharing services including Uber, Lyft and Sidecar has decreased the likelyhood of car accidents attributed to drunk driving, according to a study commissioned by Uber in conjunction with Mothers Against Drunk Driving.

The new study surveyed 807 adults in 19 cities where Uber operates, and four in five of the survey-takers said their friends were less likely to to get behind the wheel after drinking thanks to ride-sharing apps. The survey was conducted by Benenson Strategy Group in December, USA Today reported.

In California, where Uber began offering UberX service in 2012, numbers show 6.5 percent fewer drivers under 30 have been in drunk-driving related crashes – which translates to 60 fewer crashes a month, or 1,800 since UberX launched.

The study found that Uber ridership in cities including Miami and Pittsburgh increases in early hours of the morning, while in Chicago, three-quarters of Uber trips on New Year’s Eve “were requested within 200 yards of an establishment with a liquor license,” USA Today reported.

The timing of the study’s release ahead of the Super Bowl is not coincidental, said David Plouffe, Uber’s strategy chief who previously served as President Obama’s campaign manager. “It’s a day millions will be at parties at bars,” Plouffe said. From 3 p.m. Sunday to midnight ET, Uber will donate $1 to MADD for every trip taken when users enter the promo code “ThinkandRide,” he said.

The Uber/MADD poll reported “two-thirds of respondents” wanted more action from the federal government to keep drunken drivers off the road. A third of the 30,000 driving-related deaths in the U.S. in 2013 was attributable to drinking-and-driving, according to the National Highway Traffic Safety Administration. According to USA Today, “that percentage has remained stable since 2009, but represents a 50 percent drop since 1991.”