Correct answer
in one direction only, although a lane may be authorised for traffic travelling in the opposite direction.
According to the general rule, on roads with three carriageways, the outer carriageways must be used for travelling in one direction only. This means that each outer carriageway will be intended for traffic travelling in a single direction. However, there is an exception to this rule. In some cases, the authority responsible for traffic may authorise one of the lanes on the outer carriageways to be used in the opposite direction. This is done in specific situations to improve traffic flow or due to road-management requirements. As for the central carriageway, it may be intended for traffic travelling in one or both directions, depending on the signs and the instructions of the traffic authority.
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in one direction only, provided that traffic is flowing freely.
in both directions.
in one direction only, although a lane may be authorised for traffic travelling in the opposite direction.
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