"In some cities, such as New York, streets running one direction (such as north-south) are called avenues while streets running the other direction are known as streets."
I couldn't be sure about the meaning of this sentence.
Does it mean, "We have two one-way streets: the one from north to south is called avenue and the return way is called street"?
In some cities, it's the opposite (north/south = street, east/west = avenue).
This system is not used in the UK.
I think there's an ambiguity in the sentence. Just from the sentence, and not their culture, I can get the both ideas: yours and mine.
Would you please make a sentence that means: "We have two one-way streets: the one from north to south is called avenue and the return way is called street."