Fire truck sirens are loud warning devices used by emergency vehicles, particularly fire trucks, to alert drivers and pedestrians of their presence. The sirens produce distinct sounds that can be heard from a distance, helping to clear the way during emergencies. These sirens often use different tones and patterns, such as the traditional wail or yelp, to grab attention effectively. The sound is designed to cut through traffic noise, ensuring that people can hear the approaching fire truck and take necessary actions to stay safe.