North of I-95 it becomes Whitehall Avenue then becomes Main Street as it runs through the village of Old Mystic in the town of Groton. Route 27 ends a short distance later at an intersection with Route 184.
This passage describes the geographical journey of a road through the town of Groton, specifically its transition from Whitehall Avenue to Main Street as it passes through Old Mystic. It also mentions the termination point of Route 27 at an intersection with Route 184.