When changing a flat tire, you should do which of the following?

Answer: B — Both A and B

When changing a flat tire, it is important to ensure the vehicle is secure and stable before proceeding with the replacement. Blocking the wheels is a critical step; it helps prevent the vehicle from rolling, which can lead to serious accidents or injuries. By placing blocks behind or in front of the tires that are not being changed, you create a stable environment that reduces the risk of the vehicle moving unexpectedly. Additionally, putting the vehicle in a suitable gear (typically park for automatic vehicles and first gear for manuals) also contributes to maintaining stability while you work. This prevents any chance of the vehicle rolling if it is not properly blocked, ensuring that both the vehicle and the individual working on the tire are safe. Both steps are essential for proper safety protocols when changing a flat tire, which makes option B the correct response. Prioritizing safety measures such as blocking the wheels and securing the vehicle in gear is crucial to prevent accidents during this common roadside repair task.