That's OK until some nutter is banging up lane 1 at 90 overtaking slower traffic in lanes 2 / 3, when someone coming down a slip road is aiming to join the main carriageway... (Yes I know the lines at the end of the slip are Give Way).
I have driven quite a lot in USA, in places where overtaking in lane 1 is allowed and I agree such pass either side seems to work, there... Not so sure you'll manage to re-educate the masses here though!
