Symbolic meaning of ambulance
In many cultures, any symbol that stands for misfortune or unlucky associations, maintain the same meaning in dream metaphors.
Meaning of the ambulance in dream interpretation
The ambulance is an unlucky symbol. If the dreamer or someone close to them was sick, the dream symbol of an ambulance means that they are on the road to recovery. To other people, this symbol means they are going to get sick, thus the ambulance is coming for them.
If you are the dreamer, this dream maybe about yourself, or about someone around you, who is sick. If the target is very ill, then this dream symbolic is important.