CHEVROLET 1999 Corvette - Manual (Page 230)

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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.
Press this button to make
your front and rear turn
signal lamps flash on
and off.
The hazard warning flashers will work once the button
is pressed, regardless of the key position.
To turn off the flashers, push the hazard button.
When the hazard warning flashers are on, your turn
signals won’t work.