Adds a new subsection (g) to require that any fine or penalty imposed on a carrier or broker in a proceeding under section 14711 be paid to and retained by the State that imposed the fine or penalty.

Adds definitions for 'principal place of business' and 'specified entity' to section 13102.

Adds a new subparagraph requiring that a motor carrier has designated a principal place of business.

Amends freight forwarder registration requirements to require designation of a principal place of business and disclosure of certain relationships occurring within the prior 3 years.

Amends broker registration requirements to require designation of a principal place of business and disclosure of certain relationships occurring within the prior 3 years.

Allows the Secretary to withhold, suspend, amend, or revoke registrations if the registrant failed to designate a valid principal place of business.

Amends registration and USDOT number requirements to require designation of a principal place of business and adjusts an internal subsection reference.

Redesignates subsections (b), (c), and (d) as subsections (c), (d), and (e), respectively; inserts new subsection (b) establishing that if, after notice and an opportunity for a hearing, the Secretary finds a person violated a provision of part B of subtitle IV of title 49, or a regulation or order issued pursuant to such part, the Secretary shall assess a civil penalty by written notice.

Amends section 501(b) by inserting additional material at two specified locations (text of inserted material not shown in this section excerpt).

Amends 49 U.S.C. 31102 by adding enforcement of Federal household goods statutes and regulations for interstate (and compatible intrastate) transportation to subsection (h) as paragraph (3); inserting a parallel enforcement subparagraph (J) into subsection (l)(2) (redesignating the old J as K); and adding a new subsection (m) specifying that those activities are optional for States and are not a condition on funds received under this section.