Very narrow, pinstriping mandatory and heavy. Deep water bars (though fairly flat water bars, so you can keep all the wheels on the ground). The upper half has fairly soft soil, especially when wet. A couple rocky sections that require a narrow vehicle or some crawling to get over them (or some tiring road maintenance to move boulders). Crossovers MIGHT be able to get up if the road is dry and they move the biggest boulders, but it'd be a struggle. 4x4 rigs should be okay, though the corners are pretty tight so long trucks might not enjoy them