The Secretary of Transportation may require a motor carrier, motor carrier of migrant workers, or motor private carrier to file a copy of each arrangement related to a matter under this chapter that it has with another person. The Secretary may disclose the existence or contents of an arrangement between a motor contract carrier and a shipper filed under this section only if the disclosure is consistent with the public interest and is made as part of the record in a formal proceeding.

Except as provided in subsection (a) of this section, all arrangements and statistics, tables, and figures contained in reports filed with the Secretary by a motor carrier under this chapter are public records. Such a public record, or a copy or extract of it, certified by the Secretary under seal is competent evidence in a proceeding of the Secretary, and, except as provided in section 504(f) of this title, in a judicial proceeding.