ASV is an acronym that stands for "Alternate Service Vehicle", a type of emergency response vehicle used in medical emergencies or other urgent situations that require immediate medical attention. There are a few different synonyms that can be used for ASV, including ambulance, emergency medical vehicle, and rescue vehicle. Ambulance is likely the most commonly used synonym, as it is the most recognizable and widely-used type of ASV. Emergency medical vehicle and rescue vehicle may be used less often, but still refer to vehicles designed to transport patients in medical emergencies. Regardless of the term used, ASVs play an essential role in providing critical medical care in emergency situations.