49 C.F.R. § 551.68 What if an agent cannot be served?
Title 49 - Transportation
If an agent cannot be served because the agent cannot be located, has ceased to exist or does not receive correctly addressed mail, service may be made by posting the notice or process in the Office of the Secretary of Transportation.
Title 49: Transportation
PART 551—PROCEDURAL RULES
Subpart D—Service of Process on Foreign Manufacturers and Importers
Method of Service of Process
§ 551.68 What if an agent cannot be served?
