Right now, in Singapore, you can hop into a driverless taxi and go for a ride. And it's free. This article from the BBC explains some more about who is behind this trial and how it works.
It's a company called nuTonomy, a US-based start-up developer of software for self-driving cars. The company was founded in 2013 by two MIT researchers specializing in robotics and driverless technology. The firm has offices both in the US and in Singapore. Earlier this year, nuTonomy was the first company to get permission from the Singapore government to test self-driving cars in a small area of the town. It's now begun tests with passengers. The new taxi trial currently consists of a fleet of six cars - each of them has a complex system of lasers that operate like a radar to monitor the car's surrounding. In addition there are cameras that work with the software.