67 Pa. Code § 175.205
A vehicle specified under this subchapter shall have hazard warning lamps if so originally equipped which, under normal atmospheric conditions, shall be capable of being seen and distinguished during nighttime operation at a distance of 500 feet. See 75 Pa.C.S. § 4303(b), (c) and (d) (relating to general lighting requirements).
The provisions of this § 175.205 adopted December 2, 1977, effective February 1, 1978, 7 Pa.B. 3499; reserved July 9, 1982, effective July 10, 1982, 12 Pa.B. 2181; amended October 29, 1982, effective February 1, 1983, 12 Pa.B. 3862; corrected November 12, 1982, effective February 1, 1983, 12 Pa.B. 3947; readopted December 2, 1988, effective December 3, 1988, 18 Pa.B. 5362. Immediately preceding text appears at serial page (82392).