How should the bus's wipers be checked during the pre-trip inspection?

The correct procedure for checking the bus's wipers during the pre-trip inspection involves verifying proper operation and checking the condition of the blades. Ensuring that the wipers function effectively is crucial for maintaining visibility during adverse weather conditions. Inadequate wipers can lead to decreased safety, as they may not clear rain or debris from the windshield properly, impairing the driver's vision.

Additionally, checking the condition of the blades is important because worn or damaged wipers can leave streaks or failure to clear the windshield altogether, which can also endanger safety. Both aspects of this check are essential for ensuring that the bus is ready for safe operation.

While considering the other options, the length of the wiper blades is typically predetermined by the vehicle manufacturer, thus verifying length isn’t a routine check during a pre-trip inspection. Testing wipers only on sunny days would not provide an accurate assessment of their performance since they are primarily used during inclement weather. Checking for rust on the metal parts may be relevant for general bus maintenance, but it does not directly affect the functional operation of the wipers. Therefore, the focus should be on their operational effectiveness and the physical state of the blades – confirming that they are working properly and are in good condition.