In this situation, does the articulated vehicle emerging from the minor road and travelling to the left present a hazard?

In the video you are driving on a road outside town and approaching a junction marked with sign A-6a; an articulated vehicle - a tractor unit with a semi-trailer - is coming out of the minor road on the left and turning left, which means that it will enter your lane and drive ahead of you in the same direction. It may be a hazard. The answer is: yes.

The Regulation on road signs and signals states that sign A-6a warns of a junction with a minor road on both sides, and the Road Traffic Act requires you to exercise particular caution when approaching a junction; the principle of limited trust tells you to be prepared for another driver not giving way when their behaviour suggests it. An articulated vehicle is over a dozen metres long and moves off very slowly - when turning left, it must first cross the lane for oncoming traffic and then roll into your lane, taking up the whole width of the roadway for several seconds; its driver in the high cab may misjudge your distance and speed and pull out, expecting to make it in time. That is why you take your foot off the accelerator, watch the wheels of the tractor unit and are ready to brake until the combination has left the junction.

Legal basis: Art. 25 para. 1, Art. 4 and Art. 3 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 5 para. 2 of the Regulation on road signs and signals