HomeAdvisor's Gravel Driveway Cost Guide provides average prices (per square foot, yard, ton) for road base materials, including gravel, crushed rock, crush run stone, limestone and shell for building a driveway, private road or parking lot.Crushed stone is segregated into various sizes like 40mm,20mm, 10mm, etc for different uses. Crushed stone aggregates are used for construction of roads, bridges, housing, industrial building construction and other cement based products like RCC pipes, PSC poles, pre-.