Cure for parking rage...

[Piffleoffagus]

a sign for every parking misdemeanour

Ps do not use link if colourful language offends

Oh no, my cleanfeed won't let me look! That's what we get for using a local authority ISP...

good idea, could go down a treat in London.
They should make some for bad driving and you could put it up to your window as/when required, as opposed to the standard road rage hand signals!