Final answer:
Tires must be checked at the beginning of each trip and each time the vehicle is stopped because it is important for safety and optimal vehicle performance.
Step-by-step explanation:
The statement that tires must be checked at the beginning of each trip and each time the vehicle is stopped is True.
Checking the tires before starting a trip and when the vehicle is stopped is important for safety and optimal vehicle performance. By inspecting the tires, you can identify any damage or wear and adjust the tire pressure if needed. This helps to ensure proper traction, handling, and fuel efficiency.