Ride-sharing giant Uber says it is suspending use of self-driving cars after one of the vehicles struck and killed a pedestrian in the US state of Arizona.

China launches four small fleet of self-driving public buses on trail on the roads of its tech district of Shenzhen, Guangdong.

Self-driving cars are expected to usher in a new era of mobility, safety and convenience. The problem, say transportation researchers, is that people will use them too much.