How audible must the horn be on ground vehicles?

The requirement for the horn on ground vehicles to be audible from a distance of 200 feet is established to ensure safety and communication in a busy and dynamic environment like an airport. A horn that is audible from this distance is loud enough to alert nearby personnel and other vehicles of the ground vehicle's presence, thereby reducing the likelihood of accidents. This standard is critical in high-traffic areas where the potential for interaction with pedestrians and other vehicles is significant.

Ensuring that the horn meets this volume standard helps maintain an effective means of signaling in a loud environment, such as an airport, where engine noise and general background sounds could otherwise make it difficult for individuals to hear a vehicle approaching. It supports operational efficiency and safety protocols in such settings, thus making it a vital aspect of vehicle safety regulations.