What does a coverage represent in the context of roller operation?

In the context of roller operation, coverage refers to the concept of ensuring that the ground or pavement receives adequate compaction through multiple passes of the roller. It is not just about making a single pass over the pavement, as that may not provide sufficient compaction. The number of passes needs to be sufficient to achieve the desired density and stability of the material being compacted. This generally involves overlapping the passes slightly to ensure complete coverage without leaving any weak spots. It is crucial for ensuring the long-term durability and performance of the roadway. The concept of coverage is directly tied to the efficacy of the compaction process, which is essential for the overall quality of road construction.