By Jane Wakefield / BBC-UK
The firm says it is an investment in safety but privacy campaigners described it as “surveillance”.
The cameras will be on all the time but will only upload footage for 16 actions, including hard braking, driver distraction and drowsiness.
One person told CNBC the system was even triggered by the driver yawning.
The Kentucky-based driver said if someone yawns, they will be told to pull over for 15 minutes.