DETROIT (NEWSnet/AP) — Federal highway safety investigators want Tesla to explain  how it developed the solution in a recall of more than 2 million vehicles equipped with Autopilot, the company’s partially automated driving system.

Investigators with U.S. National Highway Traffic Safety Administration have concern about whether the recall remedy is effective, because Tesla has reported 20 crashes since it was sent as an online software update in December.

In a letter to Tesla, investigators said they could not find a difference between warnings to the driver to pay attention before the recall and after new software was released. The agency said it will evaluate whether driver warnings are adequate.

The agency asked for volumes of information about how Tesla developed the remedy, and specifically is probing how it used human behavior to test recall effectiveness.

The 18-page NHTSA letter asks how Tesla used human behavior science in designing Autopilot, and the company’s assessment of the importance of evaluating human factors. It also wants Tesla to identify every job involved in human behavior evaluation and qualifications of workers.

NHTSA also requested information about how the recall addresses driver confusion over whether Autopilot has been disengaged if force is put on the steering wheel. 

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