1. Make sure you have your thumb sitting on the horn at all times. Depress the horn whenever you see someone's grandmother start to take off at the stop sign without looking right.
2. If they're too deaf to hear you, firmly apply the brakes while keeping thumb on the horn. If they still have peripheral vision they should have noticed you by now. They willl stop in the middle of the intersection, look at you, look around, then look bewildered.
3. Override the impulse to get out of the car and smash their head in with a tyre iron - they'll be killed in an accident soon enough the way they're going, just be happy it wasn't your car they got splattered over - instead just glare at them.
4. Keep driving, with your thumb once again resting on the horn.

I think in the previous 5 or so years that I've been driving I would have used the horn in anger about 3 times. Usually in a life-threatening, retard-in-control-of-a-vehicle situation I'm too concerned with my own survival to bother with a sonic assault, but this last week has been another level of insanely bad.

When I am King, people will need to re-take the drivers test every 5 years. If they fail, not only will they be forbidden from driving a car, but they won't be allowed to control a shopping trolley, and they won't be allowed into the city at all once it's reached a certain density of shoppers

Haha, I agree! If you put all that into your policies, I will vote for you!