If you're not up to it, take some driving lessons or stay in the slow lane.
Slow lane? Whats that? I can only assume you mean the left hand lane which is the one you are supposed to
drive in and use the other 2 for overtaking (and the right hand is not a 'fast lane' either)

Not that a lot of people take notice of that...
Personally i think it should be 80mph, im quite comfortable at that speed and confident i could get myself out of a dangerous situation.