(1) If in your dream you crash - in a car or train or aeroplane - this probably signifies that you are in a state of anxiety over some undertaking or situation.
(2) If you are driving, the crash may symbolize an unconscious desire to punish yourself. What guilt-feelings are you harbouring? Guilt and sado-masochism often go hand in hand. Dissolve the guilt-fee lings (which are almost certainly irrational and which, anyway, can contribute nothing of value to life - your own or anyone else’s), and the violence will dissolve, too.
(3) The crash may express a (hidden) fear of mental breakdown, in which case you ought to seek help. [1]
If you hear a loud crash, such as the percussion sound of a drum or cymbals, that is a warning to calm your environment down in order to control your nerves.
For cars crashing, see wreck. [2]
Depth Psychology: Difficulties or sudden hurdles are thrown in your path.
If you dream of a car crash, see Collision, Accident and Breakdown/ Breakthrough Dreams. [5]
To hear a crash is to be alerted to an imminent problem. [8]
The bigger the crash, the greater the achievement. [10]