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Turn left ahead

You must turn left at the junction ahead.

Blue circle, white left-turning arrow

In plain English

Blue circles are positive orders — this one says the only legal move at the next junction is a left turn. Plan your lane and signal early.

Where you'll see it

At junctions where going straight or right would send you into a one-way street or banned route.

The common trap

Mixing up blue circles (you must) with blue rectangles (just information). Shape first, colour second.

Memory anchor

Blue circle = "do". The arrow isn't a suggestion — it's your only option.

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Quick answers

Frequently asked questions

What does the turn left ahead sign mean?

You must turn left at the junction ahead. Blue circles are positive orders — this one says the only legal move at the next junction is a left turn. Plan your lane and signal early.

Where will I see the turn left ahead sign?

At junctions where going straight or right would send you into a one-way street or banned route.

What mistake do learners make with this sign?

Mixing up blue circles (you must) with blue rectangles (just information). Shape first, colour second.

How do I remember this sign for the theory test?

Blue circle = "do". The arrow isn't a suggestion — it's your only option.

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