Mystery solved. A fatal Texas crash of a self-driving Tesla in which no one was found behind the steering wheel was likely caused by a speeding and alcohol-impaired driver who lost control — and wound up in the back seat, investigators say. A report released Wednesday by the National Transportation Safety Board on the fiery April 17, 2021, crackup determined anesthesiologist Dr. Will Varner, 59. who was driving a Tesla Model S, had apparently moved into the back seat after slamming into the front-seat airbag and deforming the steering wheel. The crash near Houston dominated national headlines and raised questions over Tesla’s driver-assistance programs. Following the investigation, the NTSB determined the “autopilot” system couldn’t have been used because the crash took place on a street with no lane lines. The car’s “Traffic-Aware Cruise Control” system could have been used, but it would have only allowed the car to travel a maximum of 30 miles per hour, according to the report. The 2019 Tesla was going 67 mph seconds before it slammed into a tree, causing the vehicle’s lithium-ion battery to catch fire before setting the whole car ablaze. Officials said the probable cause behind the fiery April 17, 2021, crash was the driver’s speeding, alcohol impairment and failure to control the vehicle WAPT-TV