Re: Tested a drivers skill...
I am surprised no one has mentioned children.
I'm not just talking about the ones who let them roam around the backseat instead of strapped in (seen a few in my time).
Think what happens when an child starts kicking the back of your headrest. A dropped mobile can be ignored if you have to give full attention to the road, but not a small child playing whack-a-mole with your noggin.
[In case it's not clear, I'm saying there are a plethora of daily things that we do in cars that can be distracting. We do not need a separate law covering each and every one of them, there is 'Driving without due care and attention' for issues that do not cause major injuries or fatalities, 'Dangerous driving' for those that do, and 'An accident, no action necessary', for Plod/CPS to use his discretion on]