49 U.S. Code § 31147 - Limitations on authority

(a) Traffic Regulations.— This subchapter does not authorize the Secretary of Transportation to prescribe traffic safety regulations or preempt State traffic regulations. However, the Secretary may prescribe traffic regulations to the extent their subject matter was regulated under parts 390–399 of title 49, Code of Federal Regulations, on October 30, 1984.
(b) Regulating the Manufacturing of Vehicles.— This subchapter does not authorize the Secretary to regulate the manufacture of commercial motor vehicles for any purpose, including fuel economy, safety, or emission control.


(Pub. L. 103–272, § 1(e),July 5, 1994, 108 Stat. 1013.)

Historical and Revision Notes
Revised Section Source (U.S. Code) Source (Statutes at Large)
49 App.:2519(a).
Oct. 30, 1984, Pub. L. 98–554, § 229, 98 Stat. 2853.
49 App.:2519(b).

In subsection (a), the word “prescribe” is substituted for “establish or maintain” for consistency in the revised title and with other titles of the United States Code.

The table below lists the classification updates, since Jan. 3, 2012, for this section. Updates to a broader range of sections may be found at the update page for containing chapter, title, etc.

The most recent Classification Table update that we have noticed was Tuesday, August 13, 2013

An empty table indicates that we see no relevant changes listed in the classification tables. If you suspect that our system may be missing something, please double-check with the Office of the Law Revision Counsel.

49 USCDescription of ChangeSession YearPublic LawStatutes at Large


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