Is it legal to pass a patient transporting ambulance?

This depends on if the emergency signal lights are activated. It should be noted that even with emergency lights and sirens activated, ambulances are not allowed to exceed the speed limits. That said, if the ambulance has a patient in it, but the lights and sirens are not activated, a regular motorist can pass the vehicle but is discouraged from doing so.

NO! If you pass it, other people might and the patient might be affected.