Emergency and authorized vehicles which are equipped with lights or light systems provided for in this chapter shall also be equipped with a light activation indicator which will automatically activate whenever a flashing or revolving light, flashing headlamp system, traffic control emergency directional light or authorized nonflashing or nonrevolving light is engaged.

Source

The provisions of this § 173.5 adopted November 5, 1993, effective November 6, 1993, 23 Pa.B. 5309.