What is the requirement for a car horn's audibility?

The requirement for a car horn's audibility is set to ensure that drivers can effectively communicate their presence and alert other road users to potential hazards. Being able to hear a car horn from a distance of 200 feet provides a reasonable safety margin, allowing pedestrians, cyclists, and other drivers to become aware of a vehicle's approach, especially in busy or noisy environments where sounds may be muffled. This distance helps prevent accidents by ensuring that the warning signal from the horn is loud enough to be perceived in various situations, contributing to overall road safety.

Other distances may not provide the same level of safety and awareness. For instance, a horn that can only be heard from 50 feet may be insufficient in emergency situations, while a requirement of 300 feet could be impractical and not necessary for the effective warning intended by the horn's use. Thus, the 200-foot requirement strikes an effective balance between safety and practicality.