1998 Buick Riviera Owner's Manual - Page 207

Hazard Warning Flashers Press down onthe button located on topof the steering column to make your front and rear turn signal lamps flash on and off. Your hazard warning flashers you warn others. They let also let police know you have a problem. front and Your rear turn signal lamps will flash on and off. A The hazard light on the instrument panel will also come on. Your hazard warning flashers work no matter what is position your key in, and evenif the key isn't in. To turn off the flashers, press down on the button again. When the hazard warning flashers on, your turn are signals won't work. 5-2