Aftermarket devices that can boost or augment a vehicle’s native advanced driver assistance systems are the target of a new federal investigation this week. The National Highway Traffic Safety Administration’s Office of Defects Investigation says it knows of five crashes in which drivers using devices from comma.ai crashed into stopped or slow-moving cars. Two of the crashes resulted in three deaths, and 11 people were injured in four of the five crashes, some seriously.

Comma.ai was the brainchild of George Hotz, who rose to prominence at the start of the last decade by jailbreaking iOS and hacking Sony PlayStations. In 2015, Hotz turned his attention to partially automated driver assists, which were gaining attention following Tesla’s exploits with its Autopilot system. Hotz first modified his own Acura to give it a more advanced driver assist that let him take his hands off the wheel, with the goal of selling his system to Tesla and replacing Mobileye as the company’s supplier.

(Mobileye dropped Tesla as a customer the following year after becoming unhappy with the way the car company was using Mobileye products in unintended ways.)

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