Probably another case of smaller is better. Our county is between 50-60 miles from the nearest interstate (as the crow flies), about 20 miles from the nearest divided state 4-lane, and has a whopping 1.5 miles of four lane in the county. Two traffic lights. Not a lot of main road infrastructure to maintain, and I suspect that, at some point, many of the secondary roads will go back to gravel as they were 30-40 years ago.
Bridges were another matter until recently. Some were even condemned by the Feds in the 80's after that spell of bridges collapsing under school buses, all that. All public roads in NC are state roads, and we've seen those funds going to big projects in the cities to our east, or to rebuild roads and bridges on the coast after storms. Anyway, after a lot of bitching and moaning, and a couple of law suits, we've managed to get all of the important bridges that needed it rebuilt. One fairly important bridge was on the state and fed critical list for 30+ years. Finally done last year. Other smaller bridges in the county (many) are either being replaced, or could be done with local resources. Covered wooden bridges, anyone?

Point being, small rural communities may have an advantage going forward because they simply don't have, or need, the level of infrastructure that the cities and suburbs have to maintain. We certainly aren't overbuilt in that respect, as so much of the country is. Also, as the level of traffic drops, these roads and bridges can last quite a long time in our climate with minimal maintenance.