Here’s a nice article that has a link to a study conducted at the University of California-Davis written by one of the authors of the study:
Clewlow, R.R. (2017) “New Research on How Ride-Hailing Impacts Travel Behavior” in Planetizen, October 11, 2017.
And here’s an article about that same study:
Bliss, L. (2017) “The Ride-Hailing Effect: More Cars, More Trips, More Miles ” in Citylab, October 12, 2017.
As usual, I am posting this for reference not just for my readers but for myself and my students who are currently doing research on ridesharing/ride-hailing in the Philippines.