Lets say your driving behind another player and hes 180m ahead of you, you see he has 20% damage done to his truck. Hes doing 90km/h and you are behind him for lets say 10 minutes. all of a sudden his truck turns off from the damage, with you already knowing that he is at 20%, you stay back far enough to where you won't crash in to him.
This would be a really good add-on for everyone to see and who knows, it could bring down the crash rate and see less people at the repair shop.