PLEASE do not down grade roads. There is a LOT of discussion regarding classification and matching it to the Federal Classification vs Waze Classification. So again, please do not down grade any classification.
CDOT makes this relatively easy for us.
The various County Assessor’s have parcel maps that are usually up-to-date on a weekly basis for dealing with new construction that isn’t visible on aerials as well as house numbers.
You’ll need to turn on Functional Class and Major Roads under base layers, then follow the mapping in the other thread.
I did edit one thing in that other post, from just looking at what’s classed Major Collector and where those are and what they’re used for, I decided they map better to Minor Highway than Primary. They’d get Typed that way anyhow from the US/SR = Major/max(NFC,Minor) rule.
It’s not that hard to translate either. Tan is Freeway if fully limited or Major, Red and US Highways are Major, Green and Purple are Minor unless it’s a US Highway (Major), Yellow is Primary unless it’s a State Highway (Minor) which is like 99% of them, Major Road is Primary.