You can't turn off the EDR. Deleting the data is a good question, but I expect the rulemaking that occurs after this passes will define compliant EDRs as devices with which the data cannot be tampered with or removed.

Probably not, since the point is to aid in accident investigation. Wouldn't want to give people the option to scrub incriminating evidence.

I wonder how much data these devices can store...I doubt they're putting a 100GB HD in every car to create a full historical record. It seems to me that all you would need for accident investigations is a few hours prior.