Final answer:
Drivers should inspect trucks and cargo before starting a trip, during a trip, and after completing a trip to ensure their safety and compliance with regulations.
Step-by-step explanation:
Drivers should inspect trucks and cargo before starting a trip, during a trip, and after completing a trip. Inspections before starting a trip ensure that the truck and cargo are in proper condition and comply with regulations. During a trip, drivers may need to inspect the truck and cargo to check for any issues or changes. After completing a trip, inspections are done to assess any damages or issues that may have occurred during the journey.