Located between Hong Kong and China, this bridge is quite a novel solution to flipping traffic. 

In China, people drive on the right side of the road and in Hong Kong, people drive on the left. So how do you make the transition between the two countries then?

The “flipper bridge” solves this vexing problem by “separating the two sides of traffic, using a figure-eight shape. One side of the road dips under
the other, funneling cars that were traveling on the left to the
right (and vice versa), without forcing them to encounter head-on traffic at an intersection.”

The bridge makes what should be a disorienting switch incredibly easy. I can only imagine the different configurations and patterns that went through the architects’ heads when coming up with this ingenious design!