History
The highway connecting Lawrenceville, Pennsylvania, to Rochester by way of Springwater and Avon was originally designated as NY 4 when the first set of posted routes in New York were assigned in 1924. NY 4 was renumbered to NY 2 in 1927 to avoid numerical duplication with the new US 4 in the Glens Falls area. At the Pennsylvania state line, NY 2 connected to US 111. US 111 was replaced by an extended US 15 c. 1938. US 15 was extended northward to Rochester by the following year, supplanting NY 2.
Construction began in the 1960s on the portion of the Southern Tier Expressway in Steuben County. The section from Painted Post to Campbell opened in the mid-1960s as a realignment of US 15. The former surface routing of US 15 was redesignated as NY 415. An extension of the expressway to Savona was completed by 1971, and the entirety of the highway through Steuben County was completed c. 1973. US 15 left the expressway at exit 38 in Bath to rejoin its original alignment.
In 1974, US 15 was truncated southward to Painted Post and the portion of its former routing north of Painted Post was redesignated as NY 15. Around the same time, NY 17 was realigned between Olean and Corning to use the Southern Tier Expressway instead of modern NY 417. The portion of the Genesee Expressway (I-390) from Avoca to Wayland opened to traffic in the mid-1970s. Although signage for NY 15 existed on NY 17 and I-390, no such overlap existed in reality as the southern terminus of NY 15 was defined as I-390 in Wayland by the New York State Department of Transportation (NYSDOT) as early as 1977. In 2009, NYSDOT elected to remove the NY 15 signage along the Southern Tier Expressway and I-390, effectively moving the signed terminus to I-390 in Wayland as well.
Read more about this topic: New York State Route 15
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