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U.S. transportation safety investigators found Tesla Inc.'s design of its automated driver-assist system was partly to blame for a crash in which an inattentive driver slammed into a firetruck parked on a freeway near Los Angeles in 2018.

The National Transportation Safety Board also cited the driver's failure to stop for the truck, which was parked with its emergency lights on, in the Jan. 22, 2018, crash, which caused no injuries. The driver's actions were "due to inattention and overreliance on the vehicle's advanced driver assistance system," the agency said in a final report released Wednesday.

The vehicle's design "permitted the driver to disengage from the driving task" the agency said, adding that the driver was using the system "in ways inconsistent with guidance and warnings from the manufacturer."

The findings are the latest to put the developing wave of automated driving machines under a microscope over doubts about their safety and how they interact with the people behind the wheel. In 2017, the agency cited the Tesla system's design as a contributor to a fatal 2016 crash in Florida, prompting two recommendations to the company and other manufacturers to improve the safety of partially autonomous driving tools.

Tesla defended its Autopilot suite of automation systems and said it has adjusted the time intervals between warnings the car gives drivers whose hands aren't detected on the steering wheel.

"Tesla owners have driven billions of miles with Autopilot engaged, and data from our quarterly Vehicle Safety Report indicates that drivers using Autopilot remain safer than those operating without assistance," the company said in an emailed statement. "While our driver-monitoring system for Autopilot repeatedly reminds drivers of their responsibility to remain attentive and prohibits the use of Autopilot when warnings are ignored."

In the January 2018 incident, the Tesla driver had been traveling in a left-hand carpool lane on Interstate 405 in Culver City, Calif., behind a large SUV or pickup, according to the safety board's records. That vehicle changed lanes just before reaching the firetruck and a Highway Patrol car, which had stopped in response to a previous accident and were each flashing their emergency lights.

When the other vehicle changed lanes, the Tesla sped up and hit the truck at a speed of 31 mph, the agency said.

The Tesla driver said he was looking forward, but was unable to see the firetruck with enough time to avoid the crash, according to the safety board.

A witness, however, told investigators and police that the Tesla driver had been looking down at what appeared to be a mobile device moments before rear-ending the firetruck. The safety board found no indication that the Tesla driver had been texting or making a call at the time, but couldn't determine whether the phone was being used for other purposes.

The Tesla driver, a 47-year-old man who was heading to work, had bought the car used about six months earlier. He said he purchased it partly for its Autopilot feature, which helps with some braking and acceleration functions as well as steering.

He said he obtained a manual for the car, but didn't read it. A salesman at a Tesla dealership instructed him on how to use Autopilot.

The owner's manual contains numerous warnings that it is "not a collision warning or avoidance system." It also said drivers should "never" depend on it to slow down the car.

Of the final 13 minutes and 48 seconds before the crash, the driver's hands were detected on the steering wheel for 51 seconds, according to safety board.

The car issued a visual alert telling the driver to put his hands on the wheel four times and sounded an audible warning once during that time. His hands weren't detected on the wheel for the final 3 minutes and 41 seconds, according to the report.

The National Transportation Safety Board in 2017 cited Tesla's design of Autopilot as a contributing factor in a 2016 fatal crash in Florida. In that accident, the car essentially drove itself into the side of a truck that its sensors didn't detect. The Tesla driver died.

Business on 09/05/2019

Print Headline: Tesla's system partially blamed

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