[elhigh]

What Charlie says is bang on.

Doing the limit, I'm meeting my responsibility to not exceed the limit. For my own part I will goose the throttle or drop back, whatever is easiest and most expedient, and move into the right lane where I am generally still a tad slower than everyone else. This isn't because of any perceived responsibility but a matter of politeness. At this point I am responding to my own formed perception of social responsibilities, not legal ones.

I could choose to continue at the limit in the left; that is my state-granted privilege exercised to its utmost. To go faster at the behest, explicit or otherwise, of other drivers is responding to mob rule. I am not obligated to adhere to mob rule where it conflicts with the law, i.e. posted limits.