67 Pa. Code § 167.4 – Vehicles equipped with warning devices on or after January 1, 1974.

(a) Emergency reflective triangles. Three bidirectional emergency reflective triangles that conform to the requirements of Federal Motor Vehicle Safety Standard No. 125, section 571.125.
(b) Supplementary devices. Fusees, liquid-burning emergency flares, and red electric lanterns that conform to § 167.3 (relating to types of warning devices) may be used to supplement the emergency reflective triangles required in subsection (a).

The provisions of this § 167.4 adopted October 21, 1977, effective October 22, 1977, 7 Pa.B. 3131.