AN ACT LIMITING THE OPERATION OF SEAPORTS TO HIGHLY URBANIZED CITIES AND VIABLE PORT CENTERS ONLY TO PHILIPPINE PORTS AUTHORITY AND VESTING THE LOCAL GOVERNMENTS WITH THE OPERATION, CONTROL AND ISSUANCE OF PERMITS IN ALL OTHER PORTS AND VESTING THELOCAL GOVERNMENT UNITS WITH REGULATORY FUNCTIONS IN ARRASTRE, STEVEDORING, CARGO HANDLING OPERATIONS, ISSUANCE OF PERMITS AND COLLECTIONS