If your vehicle was at fault in the collision, you cannot prevent it from being towed. If your vehicle was the one that got hit, it will not be towed unless it cannot be driven. While you may not be able to prevent your car from being impounded, you can ask questions and find out where your car will be kept. Your next step should be to immediately contact a lawyer to discuss the situation and receive guidance about how to proceed and how to get your vehicle back as soon as possible.