Definition of "compacted"

You need to excavate and remove the topsoil, line the subsoil with a geotextile, then lay and compact hardcore. Follow this with a layer of compacted "hoggin" – compacted clay, gravel and sand. This is then sprayed with hot bitumen, and has a layer of pea shingle rolled into it.

2014 August 24, Jeff Howell, “Home improvements: gravel paths and cutting heating bills ”, in The Daily Telegraph (Property)‎