Why is it important to check fluid levels before starting a bus trip?

Checking fluid levels before starting a bus trip is crucial primarily to prevent potential mechanical failures during the trip. Fluid levels, including oil, coolant, brake fluid, and transmission fluid, play a significant role in the overall performance and safety of the vehicle. Proper fluid levels ensure that the bus operates efficiently, allowing for smooth mechanical function and preventing overheating, poor braking performance, or transmission issues.

If any of these fluids are low or have not been checked, there is a risk that the bus could experience mechanical problems while on the road, which could lead to breakdowns or accidents. This proactive measure helps ensure the safety of both the driver and the passengers, maintaining the reliability of the bus throughout the journey.

The other options do not encompass the primary reasons for checking fluid levels, as they focus on aspects like speed, cleanliness, and regulatory compliance, which are secondary to the critical issue of mechanical reliability and safety on the road.