It's not shared. It replaces single lane roads where you overtake into oncoming traffic. Driving is one of those things that lots of people thing they are bette

It's not shared. It replaces single lane roads where you overtake into oncoming traffic. Driving is one of those things that lots of people thing they are better than average at. This removes drivers having to judge when it is safe to overtake, you just have to sit back and wait for the middle lane to switch back.