"8. This power under clause (b) , however, is subject to certain limitations. Sub-section (3) begins with the words "A State Transport Authority shall give effect to any directions issued under Section 43, and subject to such directions and save as otherwise provided by or under this Act shall exercise and discharge throughout the State the following powers and functions, including those in sub-clause (b) . It is clear, therefore, that the functions under sub-clause (b) could be discharged by the State Transport Authority subject to directions given to it under Section 43 of the Act and save as otherwise provided by or under the Act. In the present case it is urged that directions have been issued by the State Government under Section 43. We shall deal with this point in another place. The other limitation is that the State Transport Authority could perform the duties of the Regional Transport Authority under sub-clause (b) save as otherwise provided by or under this Act. It was contended that the Regional Transport Authority is a separate authority on which the duties referred to in clause (b) have been imposed by other provisions in Chapter IV, and since the State Transport Authority is required to act "save as otherwise provided by or under the Act" it would be disentitled to take over the functions under sub-clause (b) . Such an interpretation would obviously lead to grave incongruity. Subclause (b) , as we have already seen, provides for the exercise of the powers of the Regional Transport Authority by the State Transport Authority in certain contingencies. If the expression "save as otherwise provided by or under the Act" is construed in a