(a) The provisions of this Section apply to collective bargaining agreements (including extensions and amendments to existing agreements) between Service Boards or transportation agencies subject to the jurisdiction of Service Boards and their employees, which are entered into after January 1, 1984.
     (b) The Authority shall approve amended budgets prepared by Service Boards which incorporate the costs of collective bargaining agreements between Service Boards and their employees. The Authority shall approve such an amended budget provided that it determines by the affirmative vote of 12 of its then members that the amended budget meets the standards established in Section 4.11.