And some of those same Roads and Bridges are still in use today.

Also worth pointing out. Many of the issues with a Modern Roads stem from using cheap materials prone to breaking down. Partly to save money and partly because it ensures a steady flow of business to fix the same roads. Then you add in the complexities of the Unions and Bureaucracy. Not to mention graft and corruption endemic in some Governments. Both Local, State, and Federal.

And you end up with the current state of Modern infrastructure.