The condition of the roads depends on many factors. One I need to research more on.
The construction standard.. Did you know that the states are PROHIBITED from doing surprise inspections of the concret mix or taking "Core" samples if federal money is involved??? My only comment is no comment for safety reasons.
Some roads are just not strong enough for today's big Semi's.. Some are built stronger. Some to autobaun or modified autobaun standards (A stretch of I-75 in Detroit was done that way as a test project. Alas I did not stick around long enough to find out how well it held up).
Eisenhower started the Freeway system.. .And since he left office the roads have gone to POT(holes) in many states.