As a general rule, on roads with three carriageways, the side ones will be used...
Traffic rules
Explanation
On **three-lane roads**, the side lanes are generally used in **one-way** direction. This means that each side lane is intended for a single direction of traffic, which helps to organize traffic more efficiently and safely.
However, there is the possibility of enabling an **additional lane** in the opposite direction to the usual one. This is done to manage specific situations, such as increased traffic flow during peak hours or special events. These lanes are known as **reversible lanes** or **lanes in the opposite direction to the usual one**.

Therefore, the correct answer is that, on three-lane roads, the side lanes are used in **one-way** direction, although a lane can be enabled for the opposite direction when necessary.
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