Some of the best advice I’ve read about riding a motorcycle, that extends to driving as well:
When you see a dented, dirty or neglected car, be especially paranoid. Dents are a rolling history of mistakes, and you don’t want to be involved. Dirt and neglect show disinterest, and that disinterest probably bleeds into their driving as well.
This is so unbelievably true, especially if I’m riding around on my bike or if I’m looking for a space to park my car.