The Zhitong Finance App learned that when Tesla (TSLA.US) unveiled its Cybercab prototype last week, Musk promised to launch this autonomous taxi in large numbers. But there's a big problem: US regulations don't allow this.

The Zhitong Finance App learned that when Tesla (TSLA.US) unveiled its Cybercab prototype last week, Musk promised to launch this autonomous taxi in large numbers. But there's a big problem: US regulations don't allow this.