Retrofitting, maybe not possible, but certainly a manhole at the point where a new road spurs off an existing road, with all underground services except sewerage are available. I say sewerage is a separate case because it needs to go deeper, usually runs in the middle of the road, receiving grey water from the left and right drains, and runs down. Everything else is gradient agnostic. Separate manhole for the sewers; I mean, how often is that upgraded? Cleaning access, yes. But it doesn't need to run in a duct, does it?!
Biting the hand that feeds IT
