Which statement about horns and sirens is correct?

The statement that every licensed motor vehicle must have a horn is indeed accurate, as North Carolina law requires all motor vehicles to be equipped with a horn that is in working condition, ensuring that drivers can sound a warning when necessary to prevent accidents. The requirement is designed to enhance safety on the roads by allowing vehicles to alert other road users of their presence, particularly in situations where the driver feels it is necessary to prevent a collision or to communicate with other drivers.

In terms of sirens, while it is primarily law enforcement vehicles that are authorized to use sirens, there are exceptions in certain emergencies where other types of vehicles may be permitted to use them. However, the law stipulates that only authorized emergency vehicles can sound sirens while responding to emergencies, highlighting the specific conditions under which siren use is allowed.

Given that the first part about the requirement of having a horn is true, and that law enforcement vehicles are the primary users of sirens, the combined statements make the overall response accurate. Therefore, asserting that both statements are true aligns with current traffic regulations in North Carolina.