Vehicle - usually symbolizes our passage through the journey of life. The way that you travel through your life's journey, and your effectiveness in controlling your life.
The type of vehicle will give indications of the type of experience being related in the dream message. For instance, an ambulance will indicate a need for healing in the giving and receiving of experience, a police car will signify the need for discipline in experiences, an old car might suggest old habits, or 'things the way they used to be' or the need to change the old way of doing things...etc.

Bus - represents experiences, undertakings or relationships with groups of people, direction taken in company with others, trying to get somewhere but depending on others, and also problems pertaining to being overweight.
Stopping the bus and getting off would suggest you feel the need to stop being dependent on others. That you may want to 'break away' from group thinking, and do things on your own. If you are overweight, it could suggest that you want to change, or lose weight.
Water is emotion, and a flood would suggest an overwhelming of those emotions.

Dead body/bodies - Usually represents some area of your life that has 'died'. It can refer to the 'death' of feelings, such as hopelessness in connection with relationship and the loss of feelings about someone, the depression that follows big changes in life such as the loss of a loved one, loss of job, loss of a child-(poetically and physically), a sense your life in general is without the stimulus of motivation and satisfaction( as if you feel like your life is going nowhere ). Also, repressed anger that is killing positive expression.
The dead person/people may link several of these feelings together, as symbols often represent large areas of experience. As such, the dead could represent part of yourself you want to leave behind, to 'die' out.

Church - a place of security, safety, and peace. It could represent a need for greater spirituality in the dreamer's life. It may express religious beliefs, everyday occurrences, issues of safety, security and strength through community, religious, or self expression.
 It could also be a symbol of your own 'higher self'.. representing a sign of your growing maturity and inner faith....not just of a 'higher power' but also the faith in the inner self.
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Have you had anger issues with anyone in your waking life recently?
Is there something about your life that you want to change, to leave behind?...(an emotion, painful memory, bad habit etc)
Are you feeling pressured, or rushed, into doing something, but need more time?
Do you feel the need for security and peace?
Have you been feeling low self esteem lately?

Hope this gives you some insight, best wishes.