A regional planning commission in any regional urbanized area with a population in excess of one million shall:
(1) Be authorized to provide transportation design and transportation engineering services in support of the metropolitan transportation plan, the capital outlay program, and such related projects as may be requested and approved by member governmental entities.
(2) Not exceed five hundred thousand dollars for engineering fees or design costs for any individual project.
(3) Coordinate all transportation design and engineering with affected governmental entities, including concurrence of the Louisiana Department of Transportation and Development prior to performing any transportation design or transportation engineering services involving a state highway. Should federal funds be involved, any such projects shall be confined to the federal-aid network and shall require prior approval by the Federal Highway Administration.