past few year

Uber's Pittsburgh Project Is a Crucial Test for Self-Driving Cars

MIT Technology Review

Anyone who books an Uber in Pittsburgh in the coming weeks may discover that the person behind the wheel is also a passenger. Uber will offer customers rides in robotic taxis within a matter of weeks or days. The company has been developing the technology for the past year and has been testing it on the streets of Pittsburgh. It will launch with about a dozen taxis, with the expectation of having 100 on the road by the end of the year. The taxis will have drivers who can take control in an emergency.