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Railway signalling, urban transit and the tactile ground surfaces that carry information through the soles of the feet. What holds the group together is that every member is read under time pressure by someone who cannot stop to think — a driver at speed, a pedestrian stepping off a kerb — and that several are fail-safe by geometry rather than by instruction: a semaphore arm that falls to danger when its wire breaks, a distant signal that structurally cannot mean stop, two tactile surfaces with the same profile turned through ninety degrees to mean opposite things. Where a convention is national rather than international the records say so, which for railway signalling is nearly always.
Two amber lights showing together on one signal head.
A pivoted arm, horizontal for stop and inclined for clear.
A yellow-faced signal with a fishtail-notched arm or a yellow aspect only.
A barrier across the end of a track, often with a red lamp.
A Y-shaped track junction on a signalling diagram.
An arched outline or a suspended bar over a track.
A post-mounted board marked W or SW.
A lineside board bearing a numeral, sometimes with a route indicator.
Rounded parallel bars running across the direction of travel.
Rounded parallel bars running along the direction of travel.
A signalled crossing with both a pedestrian and a cycle symbol.
A signalled crossing with the pedestrian signal on the near side.
A cycle reservoir between two stop lines at a junction.
A bicycle with two chevrons above it, painted in the lane.
A reflective lens in a rubber housing set into the road.
A band of transverse grooves or raised ribs across the carriageway.
A white diamond outline painted in a traffic lane.
A car on an inclined line, sometimes with a counterweight.
A capital P beside a bus or train pictogram.
A two-digit number in a green-bordered panel at a junction.