how would that work if we got these new driverless cars the gov. keep mentioning? There would be no driver to read the signs.
At the moment, the person using the vehicle is still presumed to be "in charge" of it, so no change, as you have 'told' the vehicle to go there.
In the future who knows? Maybe no one will own the vehicles and they'll drop you off at your destination and then go to pick someone else up, or off to some central parking area.