generate questions: 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.
Where does 15th Street start? {sep_token} Which road starts at a dead end half way between FDR Drive and Avenue C? {sep_token} 16th Street pauses at which Square? {sep_token} Which Square stops both 15th and 16th Streets?