California Code, Public Utilities Code - PUC § 1034

When a complaint has been filed with the commission alleging that any passenger stage is being operated without a certificate of public convenience and necessity, contrary to or in violation of the provisions of this part, the commission may, with or without notice, make its order requiring the corporation or person operating or managing such passenger stage, to cease and desist from such operation, until the commission makes and files its decision on the complaint, or until further order of the commission.