| Jamie,
Me, myself and I normally phone the police and report the number plate of the offending vehicle along with make and model, finishing off with a bloody good description of how the anitcs are endangering others and the potential outcome if the call were to be ignored by the authorities.
I'm sure a police patrol pulling alongside a few miles down the road regardless of if they were still arsing about would work wonders.
Failing that....Nuke the b**t**ds |