A “crushed river rock  road base” refers to a layer of compacted, crushed rock material used as the foundation for roads and driveways, providing a stable base for the top layer of pavement (like asphalt or concrete) by evenly distributing weight and preventing cracking or deformation; it’s made from crushed river rock, and is designed to be compacted to achieve maximum density and strength. 

• Function:

  Acts as a supportive foundation for the road surface, preventing sinking and distributing vehicle weight evenly.
  
• Compaction:

  Requires thorough compaction with machinery to achieve optimal stability.
  
• Application:

  Used under asphalt or concrete pavement on roads, driveways, parking lots, and other construction projects.