Bumper stickers warn of aggressive drivers

A professor at Colorado State University in Fort Collins has found a behavioral link between bumper stickers and aggressive drivers.

Three horrors await Americans who get behind the wheel of a car for a family road trip this summer: the spiraling price of gas, the usual choruses of "are-we-there-yet?" -- and the road rage of fellow drivers.

Divine intervention might be needed for the first two problems, but science has discovered a solution for the third.

Watch out for cars with bumper stickers.

That's the surprising conclusion of a recent study by Colorado State University social psychologist William Szlemko.

Drivers of cars with bumper stickers, window decals, personalized license plates and other "territorial markers" not only get mad when someone cuts in their lane or is slow to respond to a changed traffic light, but they are far more likely than those who do not personalize their cars to use their vehicles to express rage -- by honking, tailgating and other aggressive behavior.

More of the story here.