Cadillac 1967 VVI Data Book page 141

A steady beam from either indicator light means failure
of a front or rear signal bulb on that side of the car. Always
have burned out bulbs replaced immediately.
Hazard warning flasher
In the event your car is disabled or you stop for any reason on
the highway, this Hazard Warning System, which flashes all
four turn signal lights, should be used to warn other drivers
of your presence. The turn signal indicator lights on the front
fenders also flash to assure the driver that the system is
operating.
Since the flashing of all turn signal lights universally means
"this vehicle is not moving," never drive the car with the
Hazard Warning Flasher operating.
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The system is operated by a push-pull type switch located
on the right side of the steering column just below the steering
wheel. Pushing the switch knob inward activates the flasher
mechanism regardless of the ignition switch or turn signal
lever position. Pulling the knob outward or turning the steer-
ing wheel will cancel the Hazard Warning Flasher.
If the brake pedal is applied when the Hazard Warning
Flasher is in operation, the lights will not flash, but will glow
continuously.
Cornering lights
Your Cadillac is equipped with cornering lights that operate in
conjunction with the turn signals. When the turn signal is