Our goal in Bridge Constructor is to build a bridge, and then pass through it. But as usual, it wouldn't be all that fun if it were that simple. Vinny on YouTube thankfully knows exactly how to do it in a classy way.
Crossing the bridge is actually the last thing you wanna do:
The source of the gifs, Vinny's original video, is really fun to watch:
Vinny - Breaking Bridge Constructor [Vinesauce, YouTube]