А так не может быть?
улучшенные грунтовые дороги и дороги на естественном грунте
ИМХО
The administrator, upon recommendation of the public works director and/or planning department, may on a case by case basis require that designed and engineered roads be constructed. This would be based upon the potential for problems occurring from under-designed, non-engineered roads in potentially unstable areas (i.e. steep slopes seventeen percent or greater, unstable slopes, frequently flooded areas, wetlands, etc.
http://www.co.mason.wa.us/code/commissioners/_DATA/TITLE16/Chapter_16_38_LARGE_LOT_SUBDIVISIO/16_38_022_Roads_.html
То есть они уже существуют, эти non-engineered roads, но не были построены по проекту, а, вероятно, развились из проселочных дорог
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