When driving through smoke, how should the air horn or siren be used?

Using the air horn or siren intermittently when driving through smoke is the recommended practice because it helps to alert other drivers and pedestrians to your presence in low-visibility conditions. This method provides a clear signal that can be discerned even when visibility is significantly reduced due to smoke. Continuous use might create confusion or desensitize others to the sound, while occasional blaring could lead to missed alerts during critical moments, potentially compromising safety. Sirens and air horns are important tools for emergency vehicles, and using them intermittently ensures they remain effective in communicating urgency without overwhelming others on the road.