I think we can all agree that an overpass goes over something, right? Typically, that means some sort of supporting structure. Almost always that's some sort of packed earth, at some point in the overpass's support. So I'd just drive my truck up and over the little hill formed by the dirt. it might take some honking to get through if there's traffic backed up on that cross street (which I assume, since apparently their road/overpass collapsed)

I wouldn't give my truck up. It's got too much gear I could use.

Time to pull out the map and look for service roads, railroad right of ways, etc. With a 4x4, I've got options...