The portion of the bypass from Fort Montgomery to Cornwall-on-Hudson, with the exception of a stretch northwest of Highland Falls, was constructed on a new alignment. It was built with four lanes and constructed along the sides of Storm King Mountain and other, smaller hills in the area. The high elevation of the roadway gave rise to a bevy of scenic, panoramic views that stretched for several miles into the distance; as a result, a fifth lane was added in some areas to allow motorists to stop and view the scenery. Like the section south of Fort Montgomery, the one-mile stretch that utilized the original US 9W was widened to four lanes as well. Several interchanges were built along the route, including with NY 293 and NY 307. The cut-off was opened to traffic from Fort Montgomery to NY 293 sometime in 1939 or 1940 and to Angola Road (CR 9) on September 26, 1940. The last section, from Angola Road north to Blooming Grove Turnpike north of Cornwall-on-Hudson, was opened to traffic on May 31, 1941. US 9W was realigned to follow the cut-off while its old route via the Storm King Highway became NY 218.