Context: 15th Street starts at FDR Drive, and 16th Street starts at a dead end half way between FDR Drive and Avenue C. They are both stopped at Avenue C and continue from First Avenue to West Street, stopped again at Union Square, and 16th Street also pauses at Stuyvesant Square.

Question: Where does 15th Street start?
Answer: FDR Drive

Question: Which road starts at a dead end half way between FDR Drive and Avenue C?
Answer: 16th Street

Question: 16th Street pauses at which Square?
Answer: Stuyvesant

Question: Which Square stops both 15th and 16th Streets?
Answer: Union Square