Trying to figure out what happened to the terminus of US 209 after the first half of the US 9W bypass was built. Below I reference
this Google map, which is based on the only historic maps I've been able to find (USGS topos and a 1940 census map of Kingston).
The original US 9W followed the routing I've marked with a purple line (Ulster Av - Albany Av - Broadway - McEntee - Wurts).
The original US 209 followed the red line, terminating at the red dot (Albany and Broadway).
By the late 1930s, the north half of the US 9W bypass was built (green line). At Flatbush Av, US 9W went straight through, becoming Chester St and reconnecting with its original route at Broadway. So at that time, how did US 209 connect with US 9W?
* Did the original US 9W become Business 9W, and US 209 still terminated at the same junction (red dot)?
* Was US 209 extended east on Broadway, ending at the green dot?
* Was US 209 extended north on Albany, ending at the purple dot?
* Or did US 209 have a split terminus, ending at both locations?
(By the 1960s US 209 had been rerouted to its current terminus. The southern half of the US 9W bypass (orange line) wasn't built until long after that, so that had no impact on US 209's route.)
Anyone have access to historic NYSDOT maps that might shed some light on these questions?