Although the venture sought to produce premium cars like Tesla, it would attempt a different strategy from the US company that began with relatively limited production and focuses on a single model at a time.
The National Highway Traffic Safety Administration said in March it was collecting information after a Google self-driving car struck a municipal bus in California in a minor crash. But it did not open a formal probe.
The Securities and Exchange Commission is investigating whether Tesla Motors Inc. waited too long to disclose a fatal crash in May that called into question the safety of a system in the car that takes control of steering and braking.
Carmakers have been using multiple sensors in prototypes that are in testing but not yet ready for market. A variety of technologies with overlapping capabilities is seen as a way to increase safety under a wider range of circumstances.