If you call an ambulance in your dream, then such dream signifies the solution you will find in your waking life. The ambulance that is called for your friend shows the loss of friendship or something important. The ambulance that is passing by shows unseen obstacles or the necessity for your help.
Dream dictionary: Ambulance dream meanings
…When you dream of seeing an ambulance it represents you as risky person which is not good as this might lead you to huge difficulties while dealing with your business. This dream could also represent your denial with health issues you are having. What you should do is to make sure you are not avoiding the help you are presented, you have to stop denying what is obvious. If you dream of seeing an ambulance filled with injured people it shows that you are terrified of becoming a new and better person and leaving the old personality behind. Do not let your bad habits and aggression to get onto the others. This dream could also be the meaning that your are related to someone who doesn’t do the good influence on you, you should be aware of those people. When you see someone being hit by an ambulance, it…
If inside the ambulance there is an injured person, it means that a beloved one is threatened by some hazard. If the injured person speaks or moves, it indicates we will have news from someone we forgot about lately.
…Ambulance represents caution. This dream may indicate the possibility of a violent death….