US probes whether Tesla Autopilot recall did enough to make sure drivers pay attention

abcnews.go.com:

The U.S. government’s auto safety agency is investigating whether last year’s recall of Tesla’s Autopilot driving system did enough to make sure drivers pay attention to the road

DETROIT — The U.S. government's auto safety agency is investigating whether last year's recall of Tesla's Autopilot driving system did enough to make sure drivers pay attention to the road.

The National Highway Traffic Safety Administration says in documents posted on its website Friday that Tesla has reported 20 more crashes involving Autopilot and since the recall. The crashes and agency tests raised concerns about the effectiveness of the remedy. The recall involved more than 2 million vehicles, nearly all the vehicles that Tesla had sold at the time.

The agency pushed the company to do the recall after a two-year investigation into Autopilot's driver monitoring system, which measures torque on the steering wheel from a driver's hands. In the probe, the agency was looking at multiple cases in which Teslas on Autopilot ran into emergency vehicles parked on freeways.

The recall fix involves an online software update to increase warnings to drivers. But the agency said in documents that it has found evidence of crashes after the fix, and that Tesla tried to address problems with additional software updates after the recall fix was sent out. The updates may not have worked.

“This investigation will consider why these updates were not part of the recall or otherwise determined to remedy a defect that poses an unreasonable safety risk,” the agency wrote.

A message was left early Friday seeking comment from Tesla.

NHTSA said that Tesla reported the 20 crashes in vehicles that had received the recall software fix. The agency has required Tesla