High Quality Content by WIKIPEDIA articles! New York State Route 405 (NY 405) was a state highway in Rensselaer County, New York, United States. It ran for 2.63 miles (4.23 km) between an intersection with U.S. Route 4 in North Greenbush and a junction with NY 66 just inside the Troy city limits. In between, NY 405 intersected NY 136. The entirety of NY 405 was originally part of NY 40. In the early 1970s, NY 40 was truncated northward to NY 7 in northern Troy and its former routing from US 4 to NY 66 was assigned NY 405. Ownership and maintenance of most of NY 405 was transferred to Rensselaer County on April 1, 1980, at which time the parts of the route given to the county were redesignated as part of County Route 74.