14. The Creeper
The car stops several feet behind you, which is good, but the driver could be texting away, perving on a girl in the next lane, or putting on makeup. When he or she creeps forward, and forward, and forward, how do you know you're not going to get hit? You don't, man. You just don't.
Aaron Miller is the Rides editor for Supercompressor, and can be found on Twitter. He was hit by a creeper 18 months ago. He's still annoyed by it.