In the Langenscheid dictionary the word "rot" is transcribed as
[roːt], that is, that dictionary is saying that the symbol
[r] express the "r" sound of the word "rot". However, using table  (below), it seems to me more appropriate to use the
[ʀ] to express the "r" sound of that word. For me it becomes clearer by looking at how the
[ʀ] (see video ) and
[r] are pronounced (see video ).
I believe this based on the video lesson .
Another similar question: Which symbol belonging to the IPA best represents the "r" sound of the word "Ort"? Is
For me it's
[ʀ] and for Langenscheid it's the
[r]. But according to the video  the best symbol is the