That's also the way you make bridges that you can go under - pretty much the only real way of going about it.

Edit: Though you would have it somewhat like this, on a bridge:

The Os would turn our switch on, X's turn it off. When the switch is on, the Bs would be set to the "same layer as hero", and the ='s would be set to be below the hero. When off, the switch would cause the B's to be below the hero and the ='s to be above the hero. If you use a chokepoint you can reduce the number of X's on either side and save a bit of resources. Or you can just surround the O's with X's and do it that way, but it's difficult to show with symbols how the "bridge" works in that case.