A pleasing relationship of road and terrain can be achieved by setting maxi- 
mum sight distances and using combinations of horizontal and vertical 
curvatures that restrict long-distance view f road segments — 
Y 
Timber, concrete, or metal crib walls can be used to avoid major cuts and it , | ee / 
unsightly overcast in solid rock. These walls help retain native vegetation to \ 
protect the soil mantle, and eliminate many potential maintenance problems \ . ) 
