 A continuation of the bypass (named the Western Bypass) around the southwestern portion of Canandaigua between West Avenue Extension and South Main Street was built in the late 1970s and opened to traffic as a realignment of US 20 and NY 5 by 1981.Following its completion, NY 21 was realigned onto the bypass between Bristol and South Main Streets.NY 21 turned north onto South Main Street, rejoining its previous alignment at Bristol Street.