On Monday, a Tesla Model S plowed into the back of a fire truck on a freeway near Culver City, California. The driver is claiming the car was on Tesla's Autopilot driver assistance system. As a result, the National Traffic Safety Board will be investigating both driver and vehicle factors. CNBC reports: The Culver City Firefighters Association Local 1927 union chapter tweeted out a picture of the crash on Monday afternoon. The firetruck was on the freeway helping after a motorcycle accident, the union said in an Instagram post. The post said there were no injuries. The outcome could have been much worse if firefighters had been standing at the back of the truck, Battalion Chief Ken Powell told the San Jose Mercury News. "Autopilot is intended for use only with a fully attentive driver," Tesla said in a statement sent to CNBC.