You consider the yellow line down the middle of the road to be a "GUIDELINE"??
Yup, it guides me down the road very nicely. I just keep it about a foot or so to the left side of the vehicle (except when driving in places like England, of course...). :-)
Hmmmm....I'd like to see you try to explain THAT to the cop who pulls you over for driving on the wrong side of the road!!!!
See, that's exactly the source of your misunderstanding. I know that this might seem like a radical concept to you, but I actually conform to the guidelines and thus don't get into trouble.