UK Driving Theory Practice Exam 2026 - Free Driving Theory Practice Questions and Study Guide

Windshield wipers should be replaced when they leave streaks on the window because this is a clear indication that they are no longer effectively clearing water, which can severely impair visibility during rain or adverse weather conditions. Streaking indicates wear and tear on the rubber blades, which diminishes their ability to make proper contact with the windshield. Regularly checking for streaks ensures that wipers are performing optimally, contributing to safer driving.

Replacing wipers every year regardless of condition does not take into account the actual performance of the wipers, which may last longer or shorter depending on usage and environmental factors. Only replacing them when they break might result in dangerous situations where visibility is compromised before the wipers can be replaced. Lastly, replacing them once every two years could also lead to issues if the wipers have degraded more quickly, leaving the driver at risk in adverse weather. Ensuring wipers are effective when they start to leave streaks is a proactive measure for safety.