Soon, AI police robots will scan for such behavior at traffic lights. If the AI determines you are using your personal communications device handheld while driving you will get a harsh official written warning email and a suitable fine determined by your social profile. If the AI determines you are using your personal communications device, not looking up at the road
and the light has already turned green for more than 15 seconds and pending, the robot will approach, tear the door off your vehicle, and then drag you out onto the pavement where it will summarily execute you using its high performance captive bolt pistol.
After awhile, people won't use their phones anymore while driving, but they might switch to a speaker phone.