In this situation, can you continue driving in the left lane if the right lane is free?

In the video, you are driving on a dual carriageway in a town behind a red lorry; before the junction the roadway widens into two lanes - on the left one, which you are in, a left arrow is painted, and on the right one a right arrow. You are entitled to continue driving in the left lane if the right lane is free. The answer is: yes.

The Road Traffic Act requires you to drive as close as possible to the right-hand edge of the roadway and, if lanes are marked, to occupy only one lane; however, it does not prohibit using the left lane when this results from the direction you intend to go in or from the traffic layout. The Regulation on road signs and signals states that a lane direction arrow means that driving from the lane on which it is painted is allowed only in the direction shown by the arrow - the left lane before this junction is a lane for turning left, so if that is where you are heading, you not only may but must drive in it; the Act requires you to move towards the centre of the roadway before turning left. So you drive behind the lorry, keeping a safe distance, with your left indicator switched on just before the junction, and you turn, giving way to oncoming vehicles.

Legal basis: Art. 16 para. 4, Art. 22 para. 2 point 2 and Art. 25 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 87 para. 1 of the Regulation on road signs and signals