If your car breaks down on a highway at night, you should do which of the following?

Answer: C — Both A and B.

When your car breaks down on a highway at night, taking specific safety measures is crucial to alert other drivers and protect yourself. Raising the hood of your car signals to others that there is a problem, while tying a white handkerchief to the left door handle can serve as a visual indicator that you need help. Turning on your parking lights is equally important. It makes your vehicle more visible to oncoming traffic, reducing the risk of accidents. By combining both actions, you not only signal your car's distress but also enhance your visibility, which is essential for ensuring your safety and the safety of other drivers on the road. Therefore, executing both actions effectively communicates your situation and helps protect you while waiting for assistance.