To see an ambulance in your dream indicates that your careless activities and indiscretion may lead to major problems and complications. This dream may also stem from your own fears of contracting a disease or your deteriorating health. Perhaps, you should cease what you are doing and pay closer attention to some waking situation.
To see an ambulance full of wounded passengers signifies a fear of letting go your old Self and making space for the new you. You are projecting your emotional wounds and painful experiences onto others. Alternatively, it may also mean that you are hanging around the wrong crowd and are doing yourself more harm than good.
To dream that someone is hit by an ambulance suggests that some aspect of your psyche is injured and needs immediate care and attention.
Dreaming that you are driving an ambulance indicates that you are putting the needs of others before your own. Perhaps you are letting others dictate your direction or goals in life.