A. Operation of an ambulance owned by or operated under contract to the United States Government, when providing service directly to the United States Government or any agency thereof.

B. Operation of an ambulance within city which does not normally serve city, but has been requested by city to provide assistance during periods when multiple requests for emergency ambulance services have been received, and the assistance is necessary for the timely provision of emergency ambulance services.

C. Operation of an ambulance during a declared state of emergency when such operation is in cooperation with the emergency mitigation efforts being conducted by city.

D. Any ambulance passing through city when that ambulance’s point of departure and destination are not within the corporate limits of city.