But moving phones would have to still work for everyone else except the driver, and the phone can't tell who is driving, so you'd need an off-switch for this th

But moving phones would have to still work for everyone else except the driver, and the phone can't tell who is driving, so you'd need an off-switch for this that can't be too annoying. Lots of people ride a bus twice a day, can't have all of them confirm they're not driving every 30 seconds.