In this situation, when you're changing lanes, are you obliged to indicate your intention of making such a manoeuvre?

In this situation, you are moving in an acceleration (entry) lane that will soon end, as indicated by the guide arrow visible on the road. Entering the adjacent main lane is a lane change manoeuvre. According to Art. 22 para. 5 of the Road Traffic Act, the driver of a vehicle is obliged to signal the intention to change lanes clearly and in advance.