Drivers with more bumper stickers are more aggressive

Article. In short, bumper stickers are a way of marking territory. The more territorial you are, the more bumper stickers you have. The more territorial you are, the more aggressive you are. I wonder if that holds true for people whose cars are covered with bumper stickers, of which there are at least a few in every town.

For the record, we have no bumper stickers on either car.