(parent here)
Again, I was giving my own anecdotes about my own road, but then mid-comment switched to a hypothetical "stretch of road" that someone might drive by, being maintained, and in my mind I was thinking of a four-lane highway. It was unclear.
I will say, however, that with all due respect - things are more expensive here in California than they are in FL, so while 400 meters of four-lane @ the Florida rate posted above comes out to ~1.2 Million, it's probably a fair amount more in California.
It's expensive.
Source:
Maintenance a private road outside the USA. Labour is cheaper, however, everything else is more expensive so it balances out vs US numbers last time I checked.