In the presented situation, are the drivers obliged to allow vehicles on the vanishing lane to change lanes?

In the video you are driving in town on a roadway with two lanes in your direction; signs D-14 with a "200 m" plate announce the end of the right-hand lane, traffic is flowing smoothly, and cars from the right-hand lane are moving into the left-hand lane. Drivers in the left-hand lane are not obliged to let them change lanes. The answer is: no.

The Road Traffic Act states that a driver changing lanes is obliged to give way to a vehicle travelling in the lane which they intend to enter. The zipper merge (jazda na suwak) only applies when speed is significantly reduced - in a traffic jam - when a lane ends or there is an obstacle in it: then the driver in the adjacent lane must, immediately before the place where the lane ends, let in one vehicle from the lane which is ending. In the video traffic is flowing smoothly, no one is standing still or crawling in a jam, so the ordinary rule applies: it is the driver in the ending right-hand lane who must switch on the indicator in good time, find a gap and give way to those driving in the left-hand lane, and they do not have to let this driver in. Good driving manners, however, suggest easing off the accelerator and making room.

Legal basis: Art. 22 para. 4 and 4a of the Road Traffic Act (Prawo o ruchu drogowym); § 49 para. 5 and § 50 of the Regulation on road signs and signals