If you need to warn other drivers of a real and unexpected emergency, emergency flashers can be used in most states. This applies when there is hazardous obstacle on the roadway, a sudden and serious problem with your vehicle, or any sudden health problem that affects your driving.
Be careful not to use emergency flashers if you must slow down and exit the highway because of an unexpected problem. Turn signals are normally disabled when the flashers are turned on. It can be hard for others to understand your intentions, which could result in a crash.
If law enforcement signals you to pull over, turning on your hazard lights can show the officer that you acknowledge their signal and are following the request. Slow down, turn on your hazard lights, and stop your car in a safe location.
