GorkFart kontrol
This is either Norwegian or Danish.
It’s true that ‘fart’ means speed in Swedish, but in this context ‘hastighet’ would be used (~‘hastiness’).
Hmm I’ve been to Sweden and I’ve seen many fart kontrol signs. I know because I took funny selfies in front of them
‘Fart’ does refer to speed occasionally, but the key here is that it’s always called ‘Hastighetskontroll’ in Swedish. Note the double ‘L’ in ‘kontroll’ and the compounding of ‘hastighet’ and ‘kontroll’.