Also another fair point; They probably regularly maintain most places in Rome, because there are more historical areas, and and such. But in Indiana, apparently they dont give a shit. Took 3 years for them to finish repairing a bridge.
So several very good points have been raised of why the Roman roads still exist. I'll also add that the Roman roads were made by slaves funded by the government whose goal was to make roads that would last centuries. They were not made by the lowest bidder using the cheapest legally allowed materials as to make as much profit as possible. Also even Roman roads needed to be maintained and used regularly. Roads that weren't used rapidly deteriorated into bolder strewn paths.
Hrm