36 Pa. Stat. § 3301
The commission appointed pursuant to the provisions of the act of which this is a supplement, in addition to the powers now conferred by law, shall have power to appoint such number of policemen as may be found necessary to protect the public safety and preserve order upon any such bridge so acquired or constructed. Every such policeman shall take an oath or affirmation faithfully to perform the duties of his office, which shall be administered by an officer of the Commonwealth of Pennsylvania having power to administer oaths. The policemen so appointed shall have power to make arrests for crimes, misdemeanors, and offenses of any character, or for disorder, breach of the peace, or for violations of any rules and regulations, heretofore or hereafter adopted by the joint commission, committed on any bridge so acquired or constructed, or on the approaches thereto, or other property under the control of the said commission.
36 P.S. § 3301