[comptiger5000]

I had a guy in a Dodge Neon sitting so close to my rear bumper I couldn't see his headlights driving across campus at night a couple weeks ago. Conveniently, there are speed bumps at the crosswalks. Coming up to one, I decided to just cruise right over it at 30 (campus speed limit) without even tapping the brakes. Right as my front tires hit the bump, he saw it and practically locked up his brakes behind me. He left plenty of space after that, as hitting the bump like that wouldn't have ended well for his car.

Other than that, people tend to pass pretty safely on the highway. If they start acting unsafe (even though I'm in the right lane), I'll pick up speed for a minute or two so they don't have to accelerate as hard into the next lane.