How often should you check your mirrors for a lane change?

Answer: D — Before you change lanes, after you have signaled, after you start the lane change, and after you complete the lane change

It is important to regularly check your mirrors while driving, especially when making a lane change. Option A and B are incorrect because they only suggest checking the mirrors after the lane change, rather than throughout the process. Option C is incorrect because relying solely on the sound of a horn to check your mirrors is not a safe or reliable method. Option D is the best answer because it outlines the four key moments for checking your mirrors when making a lane change, ensuring that you are aware of your surroundings before, during, and after the lane change. It is important to continuously check your mirrors during a lane change to ensure the safety of yourself and others on the road.