(6) A vehicle used or provided by a contract security company to assist in traffic control and direction at construction or maintenance sites on a public way may be equipped with auxiliary lights. Effective July 1, 1996, the auxiliary lights must be amber. Prior to July 1, 1996, the auxiliary lights must be green or amber.

(7) A Department of Public Safety vehicle operated by a motor carrier inspector may be equipped with auxiliary lights that emit an amber light.