The said joint commission is also hereby further authorized and empowered, in its discretion, to provide for the operation of motor busses or other similar vehicles on and across the said bridge, either by acquiring such motor busses or vehicles and itself providing for the operation and maintenance of the same, or by providing, by lease or other contract, for the operation and maintenance by others of such motor busses or vehicles either acquired and furnished by the said joint commission or otherwise.
36 P.S. § 3453