(a) After a public hearing, the subregional board described by § 452.301 may approve a change described by § 452.303(a) in the service plan by a favorable vote of two-thirds of the members present.
(b) If the change in the plan includes the addition of a fixed guideway route, including a route to be added under an agreement under § 452.060, the governing body of each municipality through which the route would pass must approve the route before the subregional board may add the route to the service plan.

(c) The subregional board shall give notice of a change in the service plan adopted under this section to:
(1) the commissioners court of each county in which the changed or additional right-of-way or facility is to be located if the change is located in an unincorporated area; and
(2) the governing body of each municipality in which the changed or additional right-of-way or facility is to be located.