Tesla Inc. has started rolling out a software update for customers in China that enables driver-assistance capabilities similar to those marketed as Full Self-Driving in the US.The update, which the carmaker is pushing to vehicles in batches, allows Tesla owners to use driver-assist features on city streets, according to a notification from the company on Tuesday. Tesla said the system can guide vehicles to exit ramps and intersections, and can recognize traffic signals, make turns and handle ch...