There is something about being in a car with a stranger that opens up space for deep, unexpected conversation.

Have had many conversations in Uber rides of other cities that give me new perspectives on life.

Not that you asked - but anonymity allows people to be more vulnerable! 

There was an experiment done where people were asked to share a lit room or a dark room with other folks. After an hour, researchers found that people in the darker room were more vulnerable with eachother. The details escape me but you get the point. Source: psychology degree!