(a) In the case of a transportation planning agency with county transportation commissions within its area of jurisdiction, the allocations pursuant to Sections 99313 and 99314 to the transportation planning agency shall be determined by excluding the areas also under the jurisdiction of the county transportation commissions.
(b) In the case of the transportation planning agency with the San Diego Metropolitan Transit Development Board within its area of jurisdiction, the allocations pursuant to Sections 99313 and 99314 to the transportation planning agency shall be determined by excluding the area also under the jurisdiction of the transit development board.