What criteria and constraints did the swing bridge meet? Which did it not meet? The first bridge presented is a swing bridge. The roadway of a swing bridge spins on a pillar located in the middle of the river. The mayor likes this design because the bridge will not interfere with ocean views from the city. But the business people who own the property right next to the proposed bridge location will have to tear down their docks to accommodate the movable bridge. Furthermore, the business people worry that the pillar in the middle will limit the size of ships that can travel up the river. Environmental groups believe the heavy roadway will require too much energy. The environmentalists think that the city should be looking for ways to reduce energy usage. Because of all the objections, the swing bridge design is rejected.