Five reasons experts think autonomous cars are many years away

In this Jan. 4, 2019, photo made with a slow shutter speed, one of the test vehicles from Argo AI, Ford's autonomous vehicle unit, navigates through the strip district near the company offices in Pittsburgh. The people developing self-driving vehicles say it could be anywhere from 10 years to decades before the cars will be carrying passengers in every city. Researchers are trying to conquer a number of obstacles. (AP Photo/Keith Srakocic)

PITTSBURGH: In the world of autonomous vehicles, Pittsburgh, Phoenix and Silicon Valley are bustling hubs of development and testing. 

But ask those involved in self-driving vehicles when we might actually see them carrying passengers in every city, and you’ll get an almost universal answer: Not anytime soon.