By the end of 1952, three individual highways were numbered " 401": the partially completed Toronto Bypass between Weston Road and 11 (Yonge Street); 2A between West Hill and Newcastle; and the Scenic between Gananoque and Brockville, now known as the Thousand Islands Parkway. These three sections of were 11.8, 54.7 and 41.2 km, (7.3, 34.0 and 25.6 mi), respectively. In 1964, the route became fully navigable from Windsor to the Ontario–Quebec border. In 196