List of numbered streets in Manhattan:

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.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". Where does 15th Street start?
FDR Drive