Final answer:
Using windshield wipers in bad weather requires turning on headlights for better visibility and safety.
Step-by-step explanation:
Using the windshield wipers is necessary in bad weather to improve visibility by removing rain or snow from the windshield. When you use the windshield wipers, it is important to also turn on your headlights. This is because the headlights help other drivers see your vehicle more easily in low visibility conditions, such as heavy rain or fog.