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Signs from the 1968 Vienna Convention, grouped because the Convention's whole design idea is that shape and colour carry meaning before the picture inside does. A red-bordered circle prohibits, a blue disc instructs, a red-bordered triangle warns and a rectangle informs — which is why the same bicycle drawing means 'cyclists must use this' on a blue disc and 'no cycles' inside a red ring. Two signs are given shapes reserved to them alone, the octagon and the downward triangle, so that they survive a face that is dirty or seen from behind. Every record states its jurisdiction: the Convention binds only its contracting parties and does not govern the United States.
A red octagon bearing the word STOP, requiring a driver to come to a complete halt.
A downward-pointing triangle with a red border, requiring a driver to yield to traffic on the road ahead.
A red disc with a white horizontal bar across it, prohibiting entry to all vehicles.
A rectangular blue or white sign bearing a single arrow, showing the only permitted direction of travel.
A white disc with a red border carrying a number, giving the maximum permitted speed.
A white disc with a red border showing two cars side by side, one of them red, prohibiting overtaking.
A blue square showing a walking figure on a striped crossing, marking a place for pedestrians to cross.
A red-bordered triangle warning that the road crosses a railway on the level, with or without gates.
A blue disc with three curved arrows chasing each other in a ring, marking a roundabout ahead.
A three-lamp signal head showing red, amber and green in a fixed vertical order.
A blue square bearing a white capital P, marking a place where parking is permitted.
A blue disc with a red border and a single red diagonal bar, prohibiting parking.
A blue disc bearing a white bicycle, marking a way reserved for pedal cyclists.
A sign bearing a bus silhouette, reserving a lane for buses.
A yellow diamond with a white border, marking a road whose traffic has priority at junctions.