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The efficiencies of ride hailing were supposed to all but end car ownership; instead vehicle sales are on the rise again this year, after a down year in 2020. There is also evidence that Uber and Lyft may actually spur an increase in car sales in cities where they begin operating.

Passengers have largely eschewed pooled rides and public transit in favor of private trips, leading to downtown bottlenecks in cities like San Francisco.

The need for drivers to circle around waiting for or fetching their next passenger, known as deadheading. Deadheading, Lyft and Uber estimated in 2019, is equal to about 40 percent of rideshare miles driven in six American cities. The researchers at Carnegie Mellon estimated that driving without a passenger leads to a roughly 20 percent overall increase in fuel consumption and greenhouse gas emissions compared to trips made by personal vehicles.

The researchers also found that switching from a private car to on-demand rides, like an Uber or Lyft, increased the external costs of a typical trip by 30 to 35 percent, or roughly 35 cents on average, because of the added congestion, collisions and noise from ridesharing services.