(a)
(1) It shall be the duty of every motor carrier to file with the Arkansas Department of Transportation a designation in writing of the name and post office address of a person maintaining a residence within this state upon whom or which service of notices or orders may be made under this subchapter. The designation may from time to time be changed by like writing similarly filed.
(2) Service of process or orders in proceedings under this subchapter shall be made upon a carrier by personal service upon the person so designated by it or by registered mail addressed to the designated person at the address filed.
(b)
(1) Service of notices of hearings shall be by United States mail and publication one (1) time in a newspaper of general circulation in Pulaski County.
(2) In default of designation of an agent for service of process, service of any notice or order may be made by posting in the office of the secretary of the department.
(c) Whenever notice is given by mail as provided in this section, the date of mailing shall be considered as the time when notice is served.