On roads with three carriageways, as a general rule, the side carriageways must be used:
Traffic rules
Explanation
On **three-lane roads**, the side lanes must be used in a **single direction**. This means that each side lane is intended for a single flow of traffic, either forward or backward, but not both.
However, the **authorities may establish another direction of traffic** on these side lanes if they deem it necessary. In such a case, it must be **properly signaled** to inform drivers about the change of direction.
Therefore, the general rule is that side lanes are used in a single direction, unless otherwise indicated by signs.
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