20mph zones are areas, often residential, where the speed limit is reduced and reinforced with physical traffic calming measures.
The zone sign marks the start of this area and applies until a matching end of zone sign is reached.
What this sign means
The sign shows a white circle with a red border and the number 20 inside, with the word zone underneath, distinguishing it from a normal speed limit sign.
Unlike a standard repeater limit, a zone sign means the limit applies throughout the area until you see the end of zone sign, without needing repeaters at every junction.
What to do when you see it
Reduce your speed to 20mph or below immediately and expect traffic calming features throughout the zone.
- Slow to 20mph as soon as you pass the sign
- Expect humps, narrowings or chicanes within the zone
- Stay alert for pedestrians, especially near schools
- Maintain the reduced speed until you see the end of zone sign
How this sign is tested
The theory test may ask you to distinguish a 20mph zone sign from a standard 20mph speed limit sign.
You may also be tested on how long the limit applies within a zone.
Common mistakes
Some drivers confuse a zone sign with a single speed limit sign and assume it only applies briefly.
Speeding up again after passing the first traffic calming feature, before reaching the end of zone sign, is another mistake.
Test yourself on this one
Road and traffic signs is the biggest category in the question bank with 102 questions, and signs turn up inside other categories too. Work through them free, no sign-up needed.
Practise road sign questionsFrequently asked questions
How is a 20mph zone different from a 20mph limit
A zone applies throughout an area with traffic calming until an end of zone sign, while a limit sign applies to a specific stretch of road.
Do I need to see repeater signs in a zone
No, entry and exit signs are usually enough because the limit is reinforced by physical measures throughout the zone.
Where are 20mph zones commonly found
Residential streets, near schools and in areas with high pedestrian and cyclist activity.