Some forward thinking - which we all know is most definitely not a thing when it comes to suburban development patterns - would see these installed from the beginning to ultimately save money long term on maintenance and upgrades.
Since the suburbs are an unsustainable Ponzi scheme designed to cram as much money out as possible though, they will go for the cheapest up-front option, total lifetime cost be damned.
Some forward thinking - which we all know is most definitely not a thing when it comes to suburban development patterns - would see these installed from the beginning to ultimately save money long term on maintenance and upgrades.
Since the suburbs are an unsustainable Ponzi scheme designed to cram as much money out as possible though, they will go for the cheapest up-front option, total lifetime cost be damned.
I expect structural life of the tunnels isn’t much longer than the services within them, especially with roads above.