1993 Buick Riviera Owner's Manual - Page 187

I Press the button in to make your front and rear turn off. signal lights flash on and Your hazard warning flashers work matter what no position your key is and evenif the key isn't in. in, To turn off the flashers, pull out on the collar. When the hazard warning flashersare on, your turn signals won't work. Other Warning Devices If you carry reflective triangles, you can one up at set the side of the road about300 feet (100 m) behind your vehicle. 185