[Naushad]

People use phones, phones have all the sensors required to 'sense' if the object/person is in motion. Depending on when it is in motion, the phone could partially disbale itself. this could be done by phone makers as a feature "Driving Mode". No need for extra hardware.

[darkfirefly]

I don't think this really works, for a number of reasons:

- A user-enabled feature for "Driving Mode" probably won't be enabled, because drivers intend to use their phone.

- An automatic system that (magically) detects that you are in a car won't work, because what if you are a passenger, or in the backseat?

- A system which activates when connected with the car's system could work, although drivers could again choose not to connect or a passenger could be connected instead.

(Although this system wouldn't actually work for learners/under 25s many states in Australia, since you are legally not permitted to connect your phone to the car stereo)

[dividedbyzero]

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.