State route 84 was commissioned in 1932, to serve as an inland alternative to US 1 east of New London. In 1958, it was renumbered to state route 95, to act as a temporary I-95, and in 1964 became the present-day Route 184. There's more detailed information at the Route 184 page.

If you were looking for I-84, see the Interstate 84 page.