This isn’t your typical overpass. There are two stretches of road spanning across I-78 in Union County that, to anyone driving under them, may look overgrown and abandoned. But they’re actually designed to move traffic with four feet instead of wheels — and are among the first of their kind in the nation, now being replicated in the western U.S. and Canada, an expert said The purpose of the state’s only two wildlife overpasses is to keep traffic from colliding with animals or prevent drivers from running off the road trying to avoid a collision. They also connect a county reservation that was …