Anniversary of the post horn
100 years of Du-Da-Do
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PostBus first used three-tone horns in 1924. At the time, no one could have predicted the hype the horn would cause.
If there were such a thing as an inventory of typical Swiss symbols, the Postbus three-tone horn would have to be part of it. Along with the colour yellow, it is PostBus’s most distinctive feature and signifies our brand. Because the car horns of the time were too quiet, Swiss Post had the horn developed in 1924. The triad still sounds today from three metal horns mounted on the underside of the Postbuses and equipped with an electric compressor. PostBus drivers operate it on around 120 routes.
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Video of the ‘Three-tones in unison’ campaign on 17 July 2024
Video of the ‘Three-tones in unison’ campaign on 17 July 2024
The post horn is turning 100. On 17 July 2024 at 10 a.m., drivers in the mountain regions sounded their three-tone horns in unison. Up to 700 Postbuses took part in the ‘Three-tones in unison’ initiative.