If you're driving a white vehicle, you like to present a fresh, young, modern face to the outside world. Environmental psychologist Sally Augustin points out that many contemporary brands -- Apple, for example -- are drawn to white for the same reason.
White suggests that you have taste and elegance, says Marcie Cooperman, a professor of color theory at Parsons The New School for Design in New York City. White is also associated with honesty and purity.
Or, it could be that you live in a desert climate and white doesn't absorb heat like black, and you want a car that won't bake you like a human Pop-Tart.
"However, white can be hard to keep clean in some regions," Cooperman says. "It's a high-maintenance color." Perfect for high-maintenance people, perhaps?