Correct answer
Narrowing on the right-hand side of the carriageway.
P-17a warns that the carriageway narrows on the right. It may also be used when the right shoulder becomes narrower. Under the current catalogue it is not used merely because the number of right-hand lanes decreases if the widths of remaining lanes and shoulders are unchanged. It does not indicate narrowing on both sides or on the left.
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Narrowing on the right-hand side of the carriageway.
Narrowing on the right-hand side and the left-hand side of the carriageway.
Narrowing on the left-hand side of the carriageway.
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Sign P-17A: a carriageway narrowing on the right
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