What should you check about windshield wipers during the inspection?

During a pre-trip inspection, it's crucial to verify that the windshield wipers are in good working condition and function properly. Ensuring that they are touching the window is vital because this contact allows them to effectively clear rain, snow, or debris from the windshield, providing the driver with a clear line of sight. If the wipers do not touch the windshield, they will not perform their intended function, which can pose a significant safety hazard while driving.

The other options reflect conditions that would make the wipers ineffective or unsafe to use. For instance, dry rot or missing pieces would impair the wipers' functionality, and being loose could cause them to malfunction or fail entirely. Therefore, ensuring that the wipers are securely in place and making contact with the glass is essential for safe driving conditions.