I'm sorry this is a private joke for portuguese (that probably will think I'm silly). I can't help but smile when I see these signs on the street:
"diverted" (the english word for "desviado") is very similar to the portuguese word "divertido" that means "fun" - so what i read is "fun traffic". Ha ha, got it?
Another good one is the "buses on diversion" - autocarros na diversão. Ha ha ha ha.
Ok, now everybody knows I'm silly! Forgive me I have a thing for bad jokes.