For purposes of this chapter, a traffic ticket shall consist of five copies, one of which shall be blue and shall be given to the vehicle operator who is the alleged traffic violator; one of which shall be yellow and shall be dispatched to the department for its records; one of which shall be white and shall be dispatched to the police agency of which the arresting officer is a part; one of which shall be green and shall be retained by the trial officer for his records; and one of which shall be pink and shall be dispatched by the police agency to the department for purposes of audit. Each ticket shall have a unique identifying number.