"Section 1.    The sum of ten million pesos is hereby appropriated out of any funds in the National Treasury not otherwise appropriated, to constitute a revolving fund for the construction of permanent bridges on, and for the acquisition of road rights of way and engineering surveys and investigations of, national or provincial roads in the Philippines, which shall be expended under the supervision of the Secretary of Public Works and Communications: Provided, That not less than the sum of two million pesos of said revolving fund shall be made available for the acquisition of road rights of way and for the survey and planning of roads and bridges, funds for which projects have previously been authorized by law, and which shall be repaid without interest from the construction allotments of the said projects either under the Philippine Highway Act of 1953 or under public works appropriations. Said bridges shall be declared toll bridges for a period not exceeding twenty years. Tolls shall be collected from all traffic using such bridges in accordance with rates to be fixed by a board composed of the Secretary of Public Works and Communications, as chairman, the Secretary of Finance, and the Executive Secretary, as members: Provided, however, That no toll charges shall be collected from pedestrians, whether alone or accompanying animals, or any person mounted on bicycle or an animal-drawn vehicle. The Secretary of Public Works and Communications shall issue such rules and regulations as may be necessary to implement the provisions of this Act."