A vehicle (ambulance) used to transport people who are sick or injured to a hospital; in Japan, ambulances are typically called via emergency number 119.
事故が起きたので、すぐに救急車を呼んだ。
Because an accident occurred, I immediately called an ambulance.
救急車が現場に到着するまでの間、応急処置を行った。
We provided first aid until the ambulance arrived at the scene.
救急車を呼ぶには119番に電話します。
To call an ambulance, dial 119.