While overall traffic sign detection works quite well, unfortunately there are still some outlying traffic sings. Especially, the yellow give way or sign, like the in Sweden or in Poland are still detected as false negatives. White give way signs seem to be of no issue. Since this is a right of way sign, the lack of this sign could be considered more than just an annoyance.
Furthermore, the no traffic or sign also seems to suffer proper detection, especially when inside another sign.