Which of the following is NOT mandated by the National Safety Code (NSC)?

The National Safety Code (NSC) establishes standards for the safety and operation of commercial vehicles to ensure the safety of drivers and the public. The code primarily focuses on heavy-duty trucks and commercial buses because these vehicles are used for transporting goods and passengers across various distances and typically operate under commercial standards.

Farm equipment and construction vehicles, while they can be large and heavy, are generally not subjected to the same regulatory framework as commercial vehicles under the NSC. Consequently, these types of vehicles do not have the same mandatory requirements regarding inspections, maintenance, and driver qualifications outlined by the NSC. This is why farm equipment is the correct answer to the question regarding what is not mandated by the NSC.