67 Pa. Code § 155.2
The following vehicles, in addition to those permitted by 75 Pa.C.S. § 4307 (relating to use and display of illuminated signs), may use and display illuminated signs: ambulances.
The provisions of this § 155.2 adopted August 26, 1977, effective August 27, 1977, 7 Pa.B. 2428; renumbered May 15, 1981, effective May 16, 1981, 11 Pa.B. 1678; readopted January 8, 1988, effective January 9, 1988, 18 Pa.B. 190. Immediately preceding text appears at serial page (80035).