What are the four essential parts of a vehicle that must be checked during a pre-trip inspection?

The answer focuses on the critical elements that ensure the vehicle operates safely and efficiently. Checking tires is essential because they are the only contact point between the vehicle and the road; their condition directly impacts traction and braking performance. Brakes are another vital component as they are crucial for controlling the vehicle and ensuring safe stopping. Ensuring that lights are functioning correctly is important for visibility and communication with other drivers, especially during low-light conditions or adverse weather. Fluid levels—such as oil, coolant, and brake fluid—are necessary to maintain the engine's performance and prevent mechanical failures. By routinely monitoring these four aspects during a pre-trip inspection, a driver significantly reduces the risk of breakdowns and accidents on the road.