There is no legal problem with "silence" or "any sound"!Still, there is a "tick" sound from the turn signal.

Originally it was a "sound" when the device was activated

There is no regulation about the operation sound of the turn signal

When you operate the turn signal lever (turn signal lever) to indicate your intention to turn to the left or right, you will hear a clicking sound and the operation sound of the turn signal. Now, with this operating noise, have you ever wondered why it makes a noise? Is it stipulated by law? [Photo] When I examined the Road Transport Vehicle Law regarding the operating noise of the disappeared "Apollow Inker" turn signal, I could not find any provisions such as what kind of sound should be made or what kind of sound should be made. In other words, it could be interpreted that any operating sound could be used, and conversely, it did not have to be emitted. Then, why is there an operating noise? This was a sound that was born during the development of turn signals. As you may remember, the initial direction indicator was a style called "arm tree type", and when trying to change the direction of travel, swing up either the internally illuminated indicator or the left or right. So, it was a method to inform the surrounding vehicles and people of the driver's intention. The shape of the indicator that was swung out looks like a human swinging up his arm, so it was named the arm tree type. The form evolved from this method is the current method in which one of the lamps provided on the left and right blinks by operating the turn signal lever to indicate the desired direction. At this time, the device used to make the lamp blink regularly was the turn signal relay, and the operating sound that interrupted the operating current at a constant rhythm due to the blinking of the lamp was a clicking sound.

Currently, I make sounds and dare to put them out!

The operating noise has the meaning of letting the driver know that the turn signal or hazard lamp is working.

Since the current turn signal mechanism is composed of electronic circuits, it is basically silent. In the era when the blinking turn signal system began to be established, it was necessary to manually return the turn signal lever to the neutral position after turning. The turn signal lever auto-cancel mechanism has been put into practical use to save this trouble. It is a mechanism that automatically returns the turn signal lever to the neutral position in conjunction with the movement when the vehicle turns and the steering returns to the neutral position. With the practical application of this mechanism, forgetting to return the turn signal lever (the state in which the turn signal is still operating) has virtually disappeared. By the way, regarding the operation sound of the turn signal, it can be said that the problem related to the operation of the turn signal has disappeared by the practical application of the auto cancel mechanism of the turn signal lever, but the operation sound tells the driver that the turn signal function is working. There was also work. This is the same when the hazard lamp is activated, but the operating noise alerts the driver. Although it is still an operating sound, it is meaningful to inform the driver that the turn signal or hazard lamp is working, and I think that the simple and familiar one is the easiest to understand, so it is a traditionally familiar sound, a kind of warning. That "tick" sound, which also becomes a sound, has continued to be used. If you think about it this way, it may be jarring if the operating sound has a melody like the ringtone of a mobile phone, and in terms of being easy to understand and not discomforting, the "clicking" sound may be the best.

Akihiko Ouchi