You are allowed to pass vehicles on the right side on roads where there are at least two marked lanes in the same direction and the speed limit is 70 km/h or lower.

It is also allowed to pass vehicles on the right side:

• When there are at least two marked lanes in the same direction with lane assignment signs indicating different destinations.
• When there are at least two marked lanes in the same direction and there is dense queuing in all lanes.
• If the vehicle in front turns left or if the driver is clearly preparing for a left turn.
• If the vehicle in front is used for road maintenance (for example, asphalt paving or snow ploughing).

Read more about overtaking