Tesla shares fell nearly 9% on Friday, wiping about 60bn ( 45bn) from the company's value, after the long-awaited unveiling of its so-called robotaxi failed to excite investors. Shares in the electric carmaker tumbled to 217 at market close following an event in Hollywood, where the chief executive, Elon Musk, revealed a much-hyped driverless vehicle. The stock price is down roughly 12% year-to-date. Musk said the company would start building the fully autonomous "Cybercab" by 2026 at a price of less than 30,000, and showed off a van he claimed was capable of transporting 20 people around town autonomously – which he said would reshape cities by turning car parks into parks. Before the event, he tweeted: "And all transport will be fully autonomous within 50 years."