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A blue disc carrying a horn and radiating strokes.
Also known as: Sound horn Japan
Requires a driver to sound the horn at a Japanese blind bend or crest, a sign now rare on the network.
Requires the driver to sound the horn at this point.
Contexts: Road signage
Survives mostly on old mountain roads with blind hairpins and mirrors, and is being removed elsewhere: the general Japanese rule discourages horn use, so a sign compelling it is an explicit local exception to a habit the rest of the network trains.
Contexts: Road signage
A disc in a solid tone carrying a small trumpet-shaped horn with short strokes radiating from its mouth.
The length-of-road version of the same requirement.