The bridges vary in architecture dependent on the city and its own personal taste. Bridges over water, rivers in particular, also vary dependent on there length, the longer the bridge must stretch, the more supports it needs. These bridges are used as overpasses for civilians and transport.
In terms of our Movie/Trailer, all these bridges suit what we need and all function in the same way. They all allow everything to cross it yet are small enough to be found in a city linking it to small island or location (ToyLand, in our case).