Correct answer
Narrowing on the left.
P-17b warns that the carriageway narrows on the left. Adapt speed, position and attention to the reduced width and obey existing priority rules and signs. The sign does not itself require a lane change: if moving sideways is necessary, check that it is lawful and safe. It does not indicate narrowing on the right or on both sides.
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Narrowing on the right and on the left.
Narrowing on the left.
Narrowing on the right.
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Sign P-17B: a narrowing of the carriageway on the left
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