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Rounded parallel bars running across the direction of travel.
Also known as: Hazard warning surface, Corduroy paving, Ribbed hazard surface, Rounded bars underfoot
Corduroy paving means 'hazard ahead, proceed with caution' — steps, a level crossing, the approach to an escalator. It is deliberately not directional: the bars run across the line of travel precisely so it cannot be mistaken for the guidance surface, whose bars run along it.
Warns of a hazard requiring caution — most often stairs, a ramp or a level crossing — by underfoot texture.
Contexts: Public information
Runs its bars across the direction of travel, deliberately opposite to the guidance surface, so the two cannot be confused underfoot.
Contexts: Public information
Does not indicate the nature of the hazard, only that one exists, which is why it is always paired with other information.
Contexts: Public information
A paving surface bearing parallel rounded bars of half-rod section, spaced regularly and running perpendicular to the pedestrian's line of travel.