I drive lorries for a living and you have to keep your cool when numpties cut you up cos your slower. they seem to think that your automatically going to be slow so do some proper daft shit to over / undertake you. Having a proper horn really really helps me. the trucks have cab mounted chrome jobbies, a proper old skool low and loud truck horn. it always attracts attention and if your in abit of traffic everyone looks round and can usually piece together whats gone on when theres a merc coupe at a precarious angle in front of you still sat at a red light.
that makes me feel so much better and i quite happily continue without another thought of it. when i used to let it go, another idiot would do something similar an hour later and i'd instantly snap back double and have the red mist descend, you cant do much but it puts you in the wrong mood for driving heavy machinery.

I know people will probably disagree with me but get a few extra car horns and wire them in. i've got 4 on my car lol, yes before anyone says it its a "mines bigger than yours" type affair but it works for me its also great when the chavs walk as slowly as they can across the middle of the road slowing down the traffic deliberatly (not at crossings). they cant help but jump in fright a little bit as they're so loud, and by then its all over. no amount of styling it out is going to sort it.

Joe.