I found this an interesting look into The US Forestry service's philosophy of road management through the lens of Washington State's Olympic National Forest.

"The Forest Service – a branch of the Department of Agriculture whose original purpose was to “furnish a continuous supply of timber for the use and necessities of the people of the United States” – classifies their roads into five buckets based on their method of construction and maintenance needs. And the agency seems to be highly tuned to the lifecycle of their road infrastructure..."

(Discovered through https://kagi.com/smallweb/ featured on HN a few weeks ago)