The California Highway Patrol said it used the autopilot of a speeding Tesla to stop the car after its driver fell asleep behind the wheel.
The CHP said that around 3:30 a.m. Friday, officers spotted a Tesla Model S doing about 70 mph on U.S. 101 in Redwood City, California.
The CHP cruiser pulled behind and used its lights and siren but the driver didn't wake up.
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Officers then pulled in front and began slowing to a stop, hoping the Tesla's driver-assist feature was on and would do the same.
Tesla hasn't confirmed whether the car was on autopilot but the tactic worked. The Tesla stopped.
Forty-five-year-old Alexander Samek of Los Altos was awakened and arrested on suspicion of driving under the influence. It's unclear whether he has a lawyer.