I'm thinking its a horrible accident waiting to happen.
Imagine this: you are following your lead car, and its going alright, up until WHAM! it smacks into the back of a tractor trailer. OMG you think, quickly swerving to avoid the accident. The guy next to you side swipes you, theres a some loud noises, and the next thing you know your in a ditch. A few minutes later, you look out of your car, and the ghost driver is standing over you laughing at your dumb ***.