Final answer:
Soil and rocks, vegetables and fruits, and animals and birds must all be securely covered to prevent them from falling or blowing onto the roadway, ensuring transportation safety and environmental cleanliness.
Step-by-step explanation:
Examples of loads that must be covered to avoid items falling or blowing on the roadway include soil and rocks, vegetables and fruits, and animals and birds. This practice is critical to ensure the safety of other vehicles and the cleanliness of roadsides, trails, and the environment around transportation routes. Properly securing cargo in vehicles and in cargo holds, using methods such as stowaway techniques, can prevent accidents and losses during water transportation or when hauling on rubber tires over land.