What must be reviewed regarding the vehicle's horn during inspection?

During a Maryland State Inspection, the evaluation of a vehicle's horn centers on its functionality and volume. The primary purpose of the horn is to alert other road users and emphasize safety on the road; thus, it must be in working order and sufficiently loud to be heard by others in various environments. Ensuring the horn meets these criteria is crucial for vehicle safety compliance standards.

Reviewing merely the appearance or considering sound quality, such as it sounding pleasant, does not address the fundamental requirement—functionality. Additionally, the idea that a horn can be silent as long as it looks good neglects the safety implications of having a non-functioning horn, which would fail to serve its intended purpose. Therefore, the requirement emphasizes that the horn not only exists but also performs its critical role in alerting others effectively.