Sentence:  The new <WSD>interchange</WSD> among the four Los Angeles freeways , including the grade-constructed accesses , occupies by itself no less than eighty acres of downtown land , one-eighth of a square mile , an area about the size of Rockefeller Center in New York . 
Meaning of the word marked with <WSD> tags:  a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams