RELATIONSHIP BETWEEN COUNTY PUBLIC TRANSPORTATION AUTHORITY AND PREEXISTING PRIVATE CARRIER (1) A county public transportation authority organized under chapter 36.57 RCW may not extend its operations to routes already served by a private carrier holding a certificate of public convenience and necessity under RCW 81.68.040 without either acquiring the affected operating authority and equipment of the private carrier or entering into a contract with that carrier for provision of all or part of such service.(2) A county public transportation authority organized under chapter 36.57 RCW, when extending its operations to routes already served by a private carrier holding a certificate of public convenience and necessity under RCW 81.68.040, may perform part of such service itself and contract with the private carrier to continue to operate part of the service.