If an approaching car fails to dim their lights, what should you do?

Answer: C — Both A and B

When encountering an approaching car that fails to dim its headlights, the best course of action is to employ strategies that ensure your visibility and maintain focus on the road. Watching the road ahead helps you avoid being distracted by the bright lights of the oncoming vehicle, which can impair your night vision and reduce your ability to react effectively. Additionally, flicking your headlights high and low once or twice serves as a signal to the other driver that their lights are too bright. This action can prompt them to adjust their headlights, which benefits both drivers on the road. Combining both techniques is effective because it addresses the immediate concern of glare while also taking steps to communicate with the other driver, enhancing safety for everyone involved.