In conditions of a significant reduction in speed on the roadway, is the driver of vehicle 3 required to allow the driver of vehicle 2 to change lanes?

In the traffic situation presented, under conditions of significant speed reduction, the 'zipper merge' principle applies. According to Art. 22 para. 4a of the Road Traffic Act, the driver of vehicle no. 3 is obliged to enable a lane change for vehicle no. 2, which is in the ending lane or has encountered an obstacle. This is a statutory mandate aimed at smoothing traffic flow at road narrowings in a jam.