To see roadkill in your dream represents unavoidable death. The death may be a symbolic death representing an end to a habit, behavior or idea. It is time to let go of old habits and put those ideas to rest, as you are only prolonging the inevitable. Alternatively, roadkill suggests that there is some issue in your past that is hindering your pursuit of your goals.
To dream that an animal is about to become roadkill indicates loss of control in some aspect of your life. Consider the type of animal that is hit for clues as to what aspect of your life is out of control.