NTSB

California firefighters needed to spray 50,000 gallons of water to extinguish a roadside Tesla Semi fire, the US National Transportation Safety Board (NTSB) announced in a preliminary report. Crews also used an aircraft to drop fire retardent in the "immediate area as a precautionary measure," according to the agency.The crash happened at 3:13 AM on August 19 on the I80 freeway east of Sacramento. The tractor-trailer departed the roadway while navigating a curve, struck a traffic delineator and eventually hit a tree. The driver was uninjured but taken to hospital as a precaution. California Highway PatrolThe Tesla Semi's large 900kWh…