I just wave at em. I take the high rode. Occasionally I'll ride up along side them at the light and politely point out thier mistake. Soometimes I get and apology. Resorting to physical damage of thier vehicle just lowers me to thier level. And I've come to the realization that in a battle between a 2 ton vehicle and a 250 lb biker, the biker will always lose. Tagging someones vehicle might just push them over the edge. And you might not be thier target next time out, but some innocent young kid.

Maybe I'm just a *****. But I'll use a blinkie light on the back, make sure I'm using appropriate hand signals, plan alternative routes. I don't bob and weave through traffic. I accept the fact that I'm a pedal driven vehicle in a combustion engine world. I ride defensively, as if every driver is a complete moron.

I'm older, I'm wiser. I value my life. Its not worth wasting over territorial disputes.