Any motor common carrier of passengers may add to, change, or reduce the level of its service to any point along a route over which the carrier is authorized to provide service, provided that the addition, change or reduction does not constitute discontinuance of service to any point along a route over which the carrier is authorized to serve, after the carrier has served notice in accordance with Commission regulations adopted pursuant to this Article, and without prior authorization.
625 ILCS 5/18c-6303