A fire engine (also known in some territories as a fire apparatus, fire truck, or fire appliance) is a vehicle that was made to put out fires. Fire departments often employ their vehicles for various other uses, including emergency medical and rescue purposes. Some fire trucks have big ladders. The primary purposes of a fire engine include transporting firefighters to an incident scene, providing water with which to fight a fire, and carrying other equipment needed by firefighters.
A police car (also called a police cruiser, cop car, Prowler, squad car, radio car or radio mobile patrol (RMP) ) is a ground vehicle used by police for transportation during patrols and to enable them to respond to incidents. Police cars have iron bars or glass at the back to stop the bad guys from spitting or talking to the police (talking when they don’t want them to talk to them).
(This is A CHP Ford Police Inspector utility vehicle. This is one of the many vehicle models replacing the discontinued Ford Crown Victoria Police Interceptor after 2013 in many American police departments).
An ambulance is a vehicle for transportation of ill or injured people to, from or between places of treatment for an illness or injury, and in some instances will also provide out of hospital medical care to the patient.