they are taking an unnecessary risk with someone else's comfort and safety
Bang on, and this is what winds me up.
Lots of people I knew at school or people who knew people I knew got killed on the roads, most were hit by people overtaking traffic coming the other way.
One particular section springs to mind - a long straight with trees and tall hedges down both sides - it actually has lots of hidden dips that you don't see, you just have to know they are there and not overtake.

