Except for a truck registered as a Class I or Class II, every truck, truck tractor or bus, and every motor vehicle towing a trailer shall carry three portable emergency warning devices of a type specified in § 167.3 (relating to types of warning devices), which are consistent with 49 CFR 393.95 (relating to emergency equipment on all power units).
67 Pa. Code § 167.2
The provisions of this §167.2 amended under the Vehicle Code, 75 Pa.C.S. §§ 4103, 4530 and 6103.
This section cited in 67 Pa. Code § 167.3 (relating to types of warning devices); and 67 Pa. Code § 167.8 (relating to display).