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Two California Highway Patrol officers came up with a technique on the spot to stop a speeding Tesla Model S with an allegedly drunken driver asleep behind the wheel on the 101 Freeway in Redwood City on Friday, authorities said.The encounter took place just before 4:30 a.m. on the southbound freeway near Whipple Avenue, the CHP said in a written statement. The officers saw the car traveling at about 70 mph and realized the driver appeared to be unconscious, officials said. The driver showed no response when the officers activated their emergency lights and sirens while directly behind the Tesla in an attempt to pull it over.ABC News reports officers chased the Tesla for seven miles. “Officers then positioned their patrol vehicle in front of the Tesla and began slowing directly in front of the Tesla in hoped that the ‘driver assist’ feature had been activated, and therefore, the Tesla would slow to a stop as the patrol vehicle came to a stop,” according to the statement.They were able to slow the auto-piloted car to a complete stop.After finally managing to rouse the driver, officers determined he was under the influence of alcohol, CHP officials said. Alexander Samek, 45, of Los Altos was arrested on suspicion of DUI.“We cannot confirm at this time if the ‘driver assist’ feature was activated, but considering the vehicle’s ability to slow to a stop when Samek was asleep, it appears the ‘driver assist’ feature may have been active at the time,” the statement said.Transportation analysts have been confused by the case for several reasons. Q: Isn't the system supposed to stop the car if the driver is not paying attention?A: Telsa's Autopilot is designed to safely pull over if a driver doesn't put force on the steering wheel. But some drivers have been able to fool the system. It's unclear whether that happened in the case of the sleeping driver. A similar system from General Motors called Super Cruise monitors the driver's eyes and will stop the car if they are not paying attention. Tesla CEO Elon Musk wrote on Twitter that it is "default Autopilot behavior" to gradually slow to a stop and turn on the hazard lights. "Looking into what happened here," Musk wrote.Q: Can't these cars drive themselves?A: No, they can't. All manufacturers, including Tesla, warn drivers that the systems are for assistance only and they must pay attention and be ready to take over driving. Tests by AAA and the Insurance Institute for Highway Safety both found that the systems can't handle every situation they encounter on the roads. Safety advocates criticized Tesla for naming its system Autopilot, especially after an Ohio man died in a crash while using it in Florida two years ago. The National Transportation Safety Board is investigating several other crashes in which the drivers appeared to place too much confidence in Autopilot, including one fatality earlier this year near Mountain View, California.