To amend the National Highway System Designation Act of 1995 concerning the applicability of hours of service requirements to drivers operating commercial motor vehicles transporting agricultural commodities and farm supplies.

Amends the National Highway System Designation Act of 1995 to remove from the Secretary of Transportation's authority to determine by rule whether an exemption is not in the public interest the current exemption of certain commercial motor vehicles transporting agricultural commodities and farm supplies from maximum hours of service requirements.