Why is it beneficial to use mats or cribbing under a crane?

Using mats or cribbing under a crane is beneficial primarily to reduce ground bearing pressure. When a crane operates, it exerts significant loads on the ground, which can lead to soil displacement or ground failure if the pressure is too high. By employing mats or cribbing, the weight of the crane is distributed over a larger area, effectively minimizing the pressure exerted on the ground below. This not only helps to maintain the stability of the crane but also protects the ground surface from damage associated with heavy loads.

The other options do not provide the core reason for the use of mats or cribbing. Weight distribution might be a secondary effect, but the primary goal is to manage ground pressure. Aesthetic purposes are not a practical consideration in crane operations, and while securing the crane is important, mats and cribbing primarily function to address ground stability rather than providing direct security for the crane itself. Thus, the focus on reducing ground bearing pressure encapsulates the main advantage of utilizing these support structures under a crane.