When is it illegal to use your vehicle's horn?

Using a vehicle's horn is primarily meant to signal warning and enhance safety on the road. It is illegal to use your horn as a form of communication with other drivers because this can lead to confusion, misunderstandings, and potentially dangerous situations. The horn's intended function is to alert others to your presence or to warn of an impending hazard, not to convey messages or engage in conversations.

Inappropriate horn use can disrupt the normal flow of traffic, create distractions, or provoke aggressive behaviors among drivers. Therefore, the law restricts horn usage to ensure it serves its purpose effectively and contributes to overall road safety.

The other options do not accurately reflect the circumstances under which horn use is prohibited. For example, horn use is not inherently illegal at night, nor is it restricted only in pedestrian areas or residential zones during the day, though there may be specific regulations governing noise levels in those contexts.