Re: PR stunt
"Then by definition the driver was driving too fast for the conditions."
Someone steps out in front of you and it's automatically the driver's fault? I'm not saying he wasn't driving too fast but you don't know that...
"can also be used against drivers"
Or prove their innocence if the other party makes a false claim. If data DOES proves the driver was at fault then good - bad drivers should be penalized. An independent witness (the car) is probably more reliable than two parties with personal interests influencing their testimony.
"Teslas are virtually silent when moving"
So are most modern cars when moving slowly (ie. <20mph) Tyre noise is the predominant indicator when moving at speed, not the engine.
"had to get used to pedestrians and cyclists not hearing him"
I would hope he drives with due care to other road users irrespective of their hearing capabilities. Deaf people are pedestrians, drivers and cyclists too.