"Do ride-hailing companies like Uber and Lyft make a city's traffic worse or better?

In San Francisco at least, the answer is decidedly worse, according to a newly published study in the journal Science Advances.

'It's by far the most detailed look that's been done in any given city,' says Bruce Schaller, a transportation expert and former New York deputy commissioner for traffic and planning who was not involved in the study. 'And it's certainly consistent with what we're seeing in other places.'"

Merrit Kennedy reports for NPR May 8, 2019. [2]