What is it with some people

Ok I'll set the scene...
Really heavy traffic, single carriage way, we're generally doing the speed limit. Some dumb bitch thinks it's worth tailgating me for like...20km. Finally at one point she crosses double lines to get in front of me, only to be confronted with the car that was in front of me who was doing the right thing all along. In the end (and if I saw what I think I saw), her dangerous driving saved all of 15 seconds of her trip. I was this close to sarcastically beeping my horn at her as she illegally overtook me. Part of me wished she crashed into me so I could blame her on the dodgy towbar.