Ambulance sirens are loud, attention-grabbing sounds used by emergency vehicles like ambulances to alert drivers and pedestrians of their presence. The distinct wailing or whooping noise helps clear the way for the ambulance to reach its destination quickly, especially during emergencies. These sirens typically operate at different frequencies and patterns to ensure they are heard over other noises in traffic. The use of sirens is crucial for public safety, as they signal the urgency of a medical situation and encourage others to yield the right of way.