The turn signal cover protects and improves the visibility of your turn signal lights, protecting the turn signal bulb from dust, water, impacts, and even the constant vibration of the engine and the ground. It's generally made of durable plastic or acrylic, with a design that allows for proper light diffusion so it's visible both day and night. It's recommended to check it frequently and keep it clean, which helps ensure the light is clear and visible anywhere. The turn signal cover protects your signal so every turn is safe and visible at all times.