Hit the road in L.A., and you’re likely to spot a cheeky bumper sticker … or 17. As Times contributor Renée Reizman reports, the medium that was once popularized by Dwight D. Eisenhower’s ...

Drivers who slap a bumper sticker onto their cars are more likely to drive aggressively, according to a social psychologist at Colorado State University. William Szlemko, a Ph.D. student at CSU ...

people with lots of bumper stickers and decals on their car were 16 percent more likely to succumb to road rage. As Szlemko told Nature magazine, "The number of territory markers predicted road ...