Sec. 4. (a) The lead and funeral escort vehicles in a funeral procession may be equipped with flashing amber lights that may be used only when the vehicles are used in a funeral procession.
(b) Notwithstanding any other provisions in this article that govern emergency vehicles, the lead and funeral escort vehicles in a funeral procession may be equipped with flashing red lights that may be used only when the vehicles are used in a funeral procession. The flashing red lights may only be used to gain the right-of-way at intersections and to protect a funeral procession while crossing an intersection.