What characteristic defines struck capacity?

Struck capacity is defined specifically as the volume of material that can be contained within a container, such as a truck bed or a dump truck, when the material is level with the rim. This concept is important for calculating how much material can be safely transported without exceeding the container's limits. When the material is at the rim level, it ensures that the load can be carried securely and that there’s no risk of spillage during transport. This definition emphasizes the importance of volume measurement in construction and transport contexts, where precise calculations are crucial for efficiency and safety.

The other options refer to conditions that do not accurately describe struck capacity, as they either indicate an excess of material above the rim or reference different types of capacity that do not align with the standard definition used in the industry.