Using UberX and UberPool lowers weekly commuting costs for customers, compared to owning a car, in 4 of the 5 largest U.S. cities, according to Kleiner Perkins partner Mary Meeker's latest presentation on internet trends.

Why it matters: Ride-hailing companies' lofty claims about their impact on transportation have often been met with skepticism.

Meanwhile, in China: On-demand car and bike rides continue to grow, and rides in China now make up 68% of global demand, up from 67% a year ago. But more staggering, is that this represents about 5 billion completed trips quarterly—up from only 2.5 billion trips per quarter a year ago.