Does the blinking light signal prohibit you from driving onto the tram crossing in this situation?

In the video you are driving along a street in town and approaching a tram crossing, before which the traffic lights show a flashing amber signal, and below them there is sign A-21 "tram". A flashing amber signal does not prohibit entry onto the tram crossing - it warns you and requires particular caution. The answer is: no.

The Regulation on road signs and signals states that a flashing or steady amber signal placed on an obstacle, or a flashing amber signal shown by traffic lights, warns of an existing danger or traffic disruption and requires particular caution. A ban on entry would be shown by a red signal. In addition, the same rules apply at a tram crossing as at a level crossing: the Road Traffic Act requires you to exercise particular caution and make sure that no rail vehicle is approaching, and the tram has right of way regardless of which side it comes from. You slow down, look along the tracks in both directions and drive across when there is no tram.

Legal basis: § 98 para. 6 of the Regulation on road signs and signals; Art. 28 para. 1 and 6 and Art. 25 para. 2 of the Road Traffic Act (Prawo o ruchu drogowym)