For construction projects, coarse pit run, type 8 sub base, type 32-33 road base and crushed rock provide the necessary support for heavy loads and stable ... |
The ISGG categorizes gravel roads by terrain and difficulty. It provides tire recommendations for each category, and contains event examples for each category. |
Unpaved or gravel roads are typically made from a mixture of natural or native materials of gravel and fine gradients, such as silt and clay. |
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