Final answer:
An ambulance should be parked at least 200 feet upwind from the scene of an accident where there may be a danger of hazardous liquids or fumes.
Step-by-step explanation:
As a general rule, an ambulance should be parked at least 200 feet upwind from the scene of an accident where there may be a danger of hazardous liquids or fumes. This distance is necessary to minimize the risk of exposure to the hazardous substances. By parking upwind, the ambulance crew can ensure that they are not in the direct path of any potential toxic or harmful substances.