27 CAR § 110-309. Service of formal and cross complaints

(a) The State Highway Commission will serve formal complaints. (b) It will also serve supplemental, amended, and cross complaints when it has granted leave to file such pleadings. (c) If no agent has been designated, service may be made by posting in the office of the secretary of the commission. (d) If the complaint involves only the lawfulness of rates, fares, charges, classifications, or practices, service may be made upon an attorney in fact of a carrier or freight forwarder who has filed a tariff or schedule on behalf of such carrier or freight forwarder.