Are you allowed in this situation to drive onto the adjacent right lane?

You are driving in the left lane of a wide roadway and going past a junction with traffic lights. The lanes are separated by ordinary broken lines P-1, and the silver car in the right-hand lane is already clearly ahead of you - the lane next to you is free. Nothing prohibits you from moving into the adjacent right lane - the answer is: yes.

A broken line only marks the lanes and does not restrict changing them. However, changing lanes is a manoeuvre that the Road Traffic Act says must be done with particular caution: you switch on your indicator, check your mirror and blind spot, and anyone already travelling in the lane you want to move into has right of way. A prohibition would appear only with a solid line P-2 or with line P-3, which may be crossed from one side only, with the solid line on your side.

Legal basis: Art. 22 para. 1 and 4 of the Road Traffic Act (Prawo o ruchu drogowym); § 86 para. 1 of the Regulation on road signs and signals