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If the automatic mixing feature malfunctions to super-hot, then it could be risky...
New law: driver's phone must be in semi-disabled mode
The phone can already infer it is inside moving vehicle. The bigger challenge is, how to determine the phone belongs to the driver?
Say N passengers in car (including driver), each with cell phone.
When phone infers moving vehicle, it attempts to mesh with other phones in the vehicle.
If N=1, driver is solo, phone semi-disables
If N>1, phones ask users to vote on who is the driver.
Result: 1 phone disabled (Voting tie disables both/all)
The only inconvenience here is to a passenger with a phone-less driver.
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