In this situation, outside a built-up area, are you prohibited from overtaking the vehicle in front of you on the right?

In the photo you are driving in the middle lane of the one-way roadway of a dual carriageway outside a built-up area, with noise barriers on the right; ahead of you, in the left lane, there is a grey car. Outside a built-up area you are not prohibited here from overtaking it on the right. The answer is: no.

The Road Traffic Act allows overtaking on the right on a section of road with marked lanes on a one-way roadway, and on a two-way roadway - if at least two lanes in a built-up area or three lanes outside a built-up area are intended for traffic in the same direction. The requirement of three lanes outside a built-up area applies only to a two-way roadway; the roadway in the photo is one of the two roadways of a dual carriageway, separated by a barrier, so it is one-way - and here marked lanes are enough. So you may overtake the grey car while staying in your own lane, once the general conditions are met: visibility, space, nobody is overtaking you, and the driver of the grey car is not signalling a move to the right. Overtaking on the right does not release you from the general rules: you keep a safe distance and do not cut in after the manoeuvre.

Legal basis: Art. 24 para. 10 point 1 and 2 and para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)