Indiana Code Title 8. Utilities and Transportation § 8-2.1-24-19

Sec. 19. (a) A nonresident motor carrier must file and keep on file with the department a designation in writing of the name and post office address of a citizen and resident of Indiana upon whom service of notices or orders may be made, and upon whom process issued by or under the authority of a court having jurisdiction of the subject matter may be served. Service of process in a proceeding under this chapter may be made upon the motor carrier by personal service, upon the citizen designated by the motor carrier, or by registered mail addressed to the motor carrier or designee at the last address shown by the records of the department.

(b) In default of a designation under this section, in case of vacancy, or if for any other reason the motor carrier may not be served with process, service of the notice or order may be made by serving two (2) copies of the notice or order upon the department. When service is made upon the department under this subsection, the department shall promptly mail one (1) copy of the notice or order served to the motor carrier by registered mail at the last address shown by the records of the department.

(c) When notice is given by mail under this section, the date of mailing shall be considered as the time when notice is served.