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Painted blocks that close up as a hazard nears.
Also known as: Deceleration markings Japan, Dot line Japan
Encourages Japanese drivers to slow by shortening the spacing of painted marks along the approach to a hazard.
Encourages a driver to slow on the approach to a hazard.
Contexts: Road signage
Works on perception rather than on instruction: closing the spacing makes a constant speed feel like an increasing one, so the driver slows without being told to. Japan uses the device heavily on expressway approaches to tunnels and toll plazas.
Contexts: Road signage
A run of short bars or blocks painted along the lane whose gaps grow progressively narrower in the direction of travel.