Help! Invested $10,000 so far roughing in a 520ft gravel drive up mountainous property, includes one 'hair-pin turn'. After buying new 1-ton deisel dually and 28 ft. 5th wheel I'm about to spend another $10,000 to improve it by widening it, clearing more trees, laying pug-mix top, compacting etc. I'm not on-site when this is done due to living in another state, and truck/camper is also remote. How do I make sure contractor provides sufficient width and clearance to ensure the truck/camper can make the one 'sharp' turn up the hill? Is there a method or way to calculate curve lentgh/width required? Figure the turn angle is approx. 50-60deg but length of road this happens is short; need to estimate min. width for this. thanks for all's help.