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  • § 390.3
    General applicability.
  • § 390.5
  • § 390.9
    State and local laws, effect on.
  • § 390.15
    Assistance in investigations and special studies.
  • § 390.17
    Additional equipment and accessories.
  • § 390.21
    Marking of self-propelled CMVs and intermodal equipment.
  • § 390.23
    Relief from regulations.

Part 390

Section § 390.9: State and local laws, effect on.

Below are the available interpretations for the given section. To return to the list of parts, use the Parts link above. The menu to the left provides a full list of sections that have interpretations. To view interpretations for a different section, click on the menu item.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to
View regulations for Part 390

Question 1: If an interstate driver gets stopped by a State enforcement officer for an inspection, would the inspecting officer be enforcing the Federal regulations or State regulations?

Guidance: A State enforcement officer can only enforce State laws. However, under the Motor Carrier Safety Assistance Pro gram, quite often State laws are the same as or similar to the FMCSRs.

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