First, don’t hang up. Because the function of an overpass is to divert traffic and tell you how to go where, knowing the name of the bridge is of little significance to drivers and pedestrians.
Second, it also has a name, because after all, it also has to be managed. Many of the names are conventional and easy to name, or sponsored by someone mentioned downstairs. It may also be shown on the GPS, and the locals will know it more or less.
An overpass is an interchange or intersection, and an overpass is a viaduct, which can be a component of an overpass. The two concepts are different.