The way it's shown on that page, it looks like every part of that lane can be used in both directions. In Netherland we do have separate lanes to turn left, but only before an intersection, and only to be used in the direction towards that intersection. People turning left in the other direction will be on the other side of the intersection. There will be lines on the road directing you where you're supposed to go. The left-turning lane will have a very limited length, only existing near the intersection that it's for. Also, I think there are usually traffic lights ensuring safe crossing for left-turners.

Having just a general all-purpose two-directional left-turning lane looks incomprehensibly dangerous to me.