1998 Buick Century Owner's Manual - Page 222

Hazard Warning Flashers Press the switch on top of the steering column to make your front and rear turn signal lamps flash on and off. Your hazard warning flashers work no matter what position your key is in; they even work if the key isn't in the ignition. To turn off the flashers, press the switch again. When the hazard warning flashers are on, your turn signals won't work. Other Warning Devices I Your hazard warning flashers letyou warn others. They also let police know you have a problem. Your front and rear turn signal lamps will flash on and off. If you carry reflective triangles, you can set one up at the side of the road about 300 feet (100 m>behind your vehicle. 5-2