Chevrolet Optra 2004 Owner's Manual page 112

Hazard Warning Flashers
Your hazard warning flashers let you warn others. They
also let police know you have a problem. Your front
and rear turn signal lamps will flash on and off.
3-4
Your hazard warning flashers work no matter what
position your key is in, and even if the key is not in.
Press the button to make the front and rear turn signal
lamps flash on and off. Press the button again to
turn the flashers off.
When the hazard warning flashers are on, your turn
signals will not work.
The hazard warning
flasher button is located on
the center of the
instrument panel.