Feel free to take the law into your own hands -- by making your own law. The World Question Center provides dozens of inspirational laws for your perusal. I think I like Alison Gopnik's the best. Here's mine:

M's Law of Camry Operation

The more erratically the car up ahead causing your traffic woes is weaving across the road, the more likely it is to turn out to be a Toyota Camry upon visual inspection while finally passing said car in a burst of angry speed.

Just keep your eyes peeled -- you'll see what I mean.