Two men died after a Tesla 'on autopilot with no one driving' crashed into a tree in Houston before starting a huge fire that took 32,000 gallons of water to extinguish. At one point, deputies had to call Tesla to ask them how to put out a fire in the battery. The National Highway Traffic Safety Administration (NHTSA) is now investigating 23 crashes involving Tesla cars believed to be on Autopilot, the New York Times reported. Tesla CEO Elon Musk tweeted Saturday to say that vehicles with Autopilot engaged were 'now approaching a 10 times lower chance of accident' than the average vehicle. The Society of Automotive Engineers, or SAE, has developed five levels to describe autonomous vehicles.
