Emergency vehicles are vehicles that are equipped with warning equipment to keep the cars be seen in emergency situations such as ambulances, fire trucks, towings, and police vehicles. Emergency vehicles are operated by government agencies or volunteers, such as police, fire, and medical services. They are designed to provide rapid response to those in need.
The equipments on the vehicle may be sirens, speakers, lightheads, beacons, visor lights, and first aid sets. Emergency vehicles can be seen easily, due to the loud siren speakers and bright flashing lights. 
Police cars are used by law enforcement to respond to crime scenes. Fire trucks are used by fire departments to respond to fires and provide a lot of water. Ambulances are used to transport injured or ill people to the hospitals for treatment.

Emergency vehicles are essential for various emergency situations to help people.