Patchogue–Mount Sinai Road was built as a four-lane highway, while North Ocean Avenue was originally a two-lane road. In the late 1940s, the one-lane arch bridge that carried the Long Island Rail Road over North Ocean Avenue was replaced with a concrete slab bridge with provisions for a second lane. From the 1940s into the 1970s, this bridge had an empty right of way for an unbuilt southbound lane, implying that the proposal to widen the road dated back to the post-war era. Long Island Avenue was a divided highway at this intersection decades before North Ocean Avenue was. By the mid-1970s, North Ocean Avenue was finally widened to four lanes as well, at least as far south as the Sunrise Highway (NY 27). This widening filled the gap beneath the bridge, but eliminated a connecting road to Brookrun Drive.
