Is an auxiliary horn switch acceptable if the horn works properly?

An auxiliary horn switch is not acceptable unless it is integrated into the vehicle's design as a factory-installed option. The primary concern for vehicle safety inspectors is ensuring that the horn is both functional and easily accessible. The standard requirement is for the horn switch to be located on the steering wheel, as this allows for immediate and intuitive access for the driver while operating the vehicle. Horns play a critical role in safety by enabling drivers to signal their presence and avoid potential accidents.

Having the horn switch located in other places, even if functional, could jeopardize the driver's ability to react quickly in emergency situations. This is why only factory-installed options that meet safety standards are considered compliant. Therefore, while there are additional factors around functionality and placement, the most important requirement for auxiliary horn switches is their integration into the vehicle's original design.