What are two basic reasons for covering cargo on an open bed?

Covering cargo on an open bed is primarily important for two reasons: to protect the cargo from adverse weather conditions and to prevent spills. By covering the cargo, it shields it from rain, snow, or excessive sun, which can lead to damage or spoilage, particularly for perishable items or materials sensitive to moisture. Additionally, a cover helps contain loose materials that could spill out during transport. This is especially crucial for items like gravel, sand, or agricultural products, which could create hazardous situations on the roadway if they were to fall off.

While visibility is important for safety, the main focus of covering cargo is on protection and containment rather than enhancing visibility or securing the load which can be managed with proper tie-downs. The ideas of maintaining temperature and providing shade are generally secondary benefits rather than primary reasons for using a cover. Increasing load weight or preventing theft do not directly pertain to the primary guiding principles of cargo coverage. Hence, the correct choice effectively addresses the key functions of covering cargo.