35 years ago when took forestry in school we had 2 semesters of "roads"...mostly about using aerial photos to locate/lay them out find potential gravel deposits, fabricating dirt roads (layering gravel), as well as doing curve layout etc....our final project involved calculating how much timber had to be harvested along the way to help finance the road building...if I recall correctly it was something like a million bucks a mile to build forestry roads back then