 NY 3 enters the intersection from the south and leaves it to the east, following the right-of-way of NY 104B northeastward along Lake Ontario.NY 104B effectively serves as a northerly bypass of the village of Mexico, located to the south of NY 104B's eastern terminus at the junction of NY 3 and NY 104.The entirety of NY 104B is part of the Seaway Trail, a National Scenic Byway that extends across most of Upstate New York from the Pennsylvania state line to Massena.