75 Pa.C.S. § 3102: Obedience to authorized persons directing traffic.

No person shall willfully fail or refuse to comply with any lawful order or direction of:

(1) any uniformed police officer, sheriff or constable or, in an emergency, a railroad or street railway police officer;

(2) any appropriately attired person, including an agent or employee of the funeral director during a funeral, authorized to direct, control or regulate traffic;

(3) any employee who has been trained in traffic control by a licensed and insured private security company and who is acting in the scope of employment; or

(4) any driver of a certified escort vehicle as defined under section 3108 (relating to drivers of certified escort vehicles) and who is acting in the capacity as a driver of a certified escort vehicle.