There are more than 130 car brands in this world. Why are there so many car brands? It is because automobile is not just a means of transportation. Many people give symbolic meaning and affection to automobiles that they own. Some people think that their cars express their identities and social status. This phenomenon has been widely observed in Seoul, especially among the Millennial Generation. What if people who give symbolic meaning and affection to automobiles drive more frequently and higher mileage? What if those drivers show undesirable (sometimes illegal) traffic behavior such as speeding, cutting in, and villain parking? These are major research questions that this study investigates. A series of our statistical analyses find that car owners who give symbolic meaning and strong affection to cars drive more frequently, and they drive higher mileage. Furthermore, people who love their cars are more likely to tolerate undesirable traffic behavior. This findings suggest that how people think about their cars have social effects; they cause additional carbon emission and higher congestion cost. This means that transportation planners and policy makers need to devise new transportation policy to affect people’s minds on automobiles.