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HornBrazil

Learn traffic rules with clear explanations and visual examples in our illustrated book, designed to make studying simple and engaging.

Traffic signs
Traffic rules
Brazil

21. Horn

A horn is a sound-producing device used to warn other road users of danger or to attract their attention when necessary for safety. Most motor vehicles are equipped with an electric horn operated from the steering wheel. Traffic laws generally restrict unnecessary or excessive horn use, especially in built-up or residential areas. The horn should therefore be used as a warning device rather than as a way to express frustration or greet other road users.

Horn
Using horns prohibited near a hospital. (Belo Horizonte, Brazil)
Wikimedia.org • Andrevruas • CC BY
What is a car horn?

A car horn is a sound-producing warning device used to alert other road users when their attention is needed for safety.

When should you use the horn?

The horn should generally be used when a sound warning is necessary to help prevent danger or an accident. The exact circumstances in which horn use is permitted depend on local traffic laws.

Can you use the horn to show annoyance?

Generally, no. A horn is intended as a safety warning device, and unnecessary or excessive use may be prohibited by local traffic rules.

Can you use the horn at night?

Rules for using the horn at night vary between countries. Some traffic laws restrict sound signals at night and require drivers to use their lights instead, except when there is immediate danger.

Can a vehicle horn be modified?

Vehicle horns may have to meet technical requirements for their sound and operation. Horns that imitate emergency-service sirens or otherwise fail applicable vehicle standards may be prohibited.

Is the horn checked during a vehicle inspection?

In countries with periodic technical inspections, the operation and condition of the horn may be checked as part of the vehicle's safety equipment.

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