As gravel surfaces are not waterproof, the crossfall of gravel roads is typically greater than for sealed roads, usually in the order of 4 or 5 percent. Gravel road shoulders also tend to be steeper depending upon the nature of the shoulder material. Ponding of water in depressions in the pavement can have serious results because of the consequent weakening of the pavement material and its displacement under wheel loading.
Gravel roads need to be graded on a regular basis to prevent damage from water and to maintain the surface in reasonable condition for traffic.
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