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Blisters underfoot at a hazard.
Also known as: Blister paving, Detectable warning surface, Truncated dome surface
The ground surface of raised domes warning of a hazard ahead, detectable through a shoe or a cane.
Warns of a hazard ahead — a carriageway, a platform edge or a stair — detectable underfoot and by cane.
Contexts: Public information
Distinguished from directional surfaces of parallel bars, which guide along a route rather than warn: domes mean stop and bars mean follow, and laying the wrong one is an active hazard rather than a cosmetic error.
Contexts: Public information
Only works if laid to the correct depth and across the full width of the approach, so an incorrectly installed surface asserts a warning it does not deliver.
Contexts: Public information
A panel of regularly spaced raised domes set into the ground surface, laid across the line of travel at a crossing, a platform edge or a stair head.
Domes warn of a hazard and bars guide along a route; laying the wrong surface is an active hazard.