Gravel Roads: Theory and Engineering. How Are Roads Built?. Evolution Stock trails Double tracks Gravel road Asphalt road Revolution New construction. Typical Gravel Road Section. Unimproved double track. Roadbed has been shaped but no imported gravel.
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Design Traffic Loads
Heavier Traffic Loads
Very Heavy Traffic Loads
1. Keep water out
2. Get water out
3. Use materials not weakened by water