Average speed check sign

What it means

Your average speed is being measured over this length of road.

Two cameras are used to measure the average speed of a vehicle between two points.

Keeping to the limit along the whole length is the only way to avoid a penalty.

Where you'll see it

On roads with average speed camera systems, such as long road works on motorways.

Rules to know

• Length of road where two cameras are used to measure the average speed of a vehicle between two points.

  Know Your Traffic Signs, p. 22

Read more

• UK speed limits: the national limits and the signs that set themUK speed limits by road and vehicle: 30 mph in built-up areas (20 mph in Wales), 60 mph on single carriageways and 70 mph on dual carriageways and motorways.
• Stopping distancesHow far it takes to stop at each speed, from the Highway Code.

Common mistakes

• Mistake: Speeding between the cameras and slowing down at them.

  Instead: The system measures your average speed. Keep to the limit throughout.

Test yourself

Recalling the answer helps it stick. Pick an answer to see how you did.

Question 1 of 1

What does this sign mean?

• ADisplay a parking disc showing your arrival time
• BA length of road with average speed cameras
• CA road physically closed to through traffic
• DHospital with A&E

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