Requires alternating high and low, two-toned signal devices on emergency services vehicles

This bill requires all non-exempt emergency vehicles in New York City to use signal devices that produce an alternating high and low, two-toned sound (instead of single-tone sirens), while also limiting maximum sound levels to under 90 decibels at 50 feet. It directly affects police, fire, and ambulance vehicles not responding to medical emergencies, mandating they meet these sound standards. Vehicles must undergo annual testing and certification to confirm compliance, with exemptions for medical emergency responses and specific city departments. The law aims to reduce noise pollution while maintaining emergency vehicle safety and effectiveness.