When is it necessary to display a steady red light on an ambulance?

Displaying a steady red light on an ambulance is crucial in situations of extreme hazard. This visual signal alerts other drivers and pedestrians to the presence of an emergency vehicle, prompting them to yield or exercise caution. The steady red light serves to enhance visibility and communicate the urgency of the situation, facilitating safer responses from other road users.

In contrast to the chosen scenario, using the red light every time the ambulance is in motion would not be appropriate as it could lead to confusion or desensitization among the public regarding emergency situations. Passing other vehicles does not specifically warrant the use of a steady red light, as the primary function is to indicate a response to an emergency or critical situation. Finally, displaying a red light when finishing a shift is unnecessary and would not contribute to any safety protocols, as the light is intended for use during emergencies while en route.