The fire trucks are often closer to the scene than ambulances. Yes, some fire stations have ambulances. Another reason might be that you want a secured scene when the ambulance arrives. read more
My crew and I on the fire truck were 10 minutes closer to a cardiac arrest, since the ambulance at my station was on a call, we arrived on scene and began patient care, which CPR was being done, we were able to use our equipment on the fire truck to get a pulse back and the ambulance just had to transport the patient to the hospital. read more