A white disc with a red border carrying a number, giving the maximum permitted speed.
Also known as: Maximum speed sign, Red circle with a number
The speed limit sign states the maximum speed permitted on the road ahead. The number carries no unit, so the same sign reads as kilometres per hour in most of the world and miles per hour in a few countries.
Sets the maximum speed at which a vehicle may lawfully travel on the road beyond the sign.
Contracting parties to the 1968 Vienna Convention · Contexts: Road signage
Is a prohibitory sign: a white disc with a red annulus, carrying the limit as a black numeral.
Contracting parties to the 1968 Vienna Convention · Contexts: Road signage
Omits the unit, so the reading depends on the country: the same numeral means kilometres per hour across most of the world and miles per hour in the United Kingdom and the United States, among others.
Contexts: Road signage
A white disc bordered by a broad red ring, carrying one or more black numerals centred inside it and no unit of measurement.
Both are prohibitory signs sharing the red-annulus-on-white construction.