Which of the following is NOT a way to increase visibility while driving?

Driving with headlights off during the day is indeed not a way to increase visibility while driving. In fact, headlights are an essential safety feature that enhances a vehicle's visibility to other road users, especially under conditions of low light, bad weather, or when driving through shaded areas. Many vehicles are equipped with daytime running lights specifically designed to increase visibility during the day.

Using turn signals is crucial for communicating intentions to other drivers, effectively improving visibility of your actions on the road. Hazard lights serve as a warning to others in case of emergencies, making the vehicle more visible and signifying that it might be stopped or moving unusually. Waving at other drivers, while a friendly gesture, does not contribute to overall road visibility or safety, but it is not a standard or effective method for signaling presence or intentions on the road.