From /. comes this finding from Colorado State University. Szlemko found a link between road rage and the number of personalized items — such as bumper stickers — on or in people’s vehicles.
“The number of territory markers predicted road rage better than vehicle value, condition, or any of the things that we normally associate with aggressive driving,’ says [ Colorado State University psychologist William ] Szlemko. What’s more, only the number of bumper stickers, and not their content, predicted road rage… Szlemko suggests that this territoriality may encourage road rage because drivers are simultaneously in a private space (their car) and a public one (the road). ‘We think they are forgetting that the public road is not theirs, and are exhibiting territorial behavior that normally would only be acceptable in personal space,’ the researcher says.