Dreaming of wrecking something can personify the exploration of self defeating behavior. It may be that a negative outlook is undermining your success. To dream of a wreck on the road up ahead can symbolize the knowledge of unconscious tendencies (like addiction) that you know are not good for you. If the police direct you to take another route- some aspect of your conscience is warning you. Stopping just before you wreck your car can be a message about changing your behavior.