Choose the Right Sand and Gravel for Your Home Project | A ...
Driveways can be made with crushed gravel and utility sand in a concrete mix, or gravel laid as is. When using gravel, it is recommended to layer gravel stones in three layers, with the largest on the bottom (34 inches in diameter), medium in the middle (23 inches in diameter), and crushed gravel on the top (3/8 inch in diameter).