... I have seen examples of stubs being constructed, end up as a ghost road for the next 3 or 4 decades, then suddenly are a thing that exists. I 5 opened in 1963 without ramps to I 84 east initially, but stubs existed.
Yes we had a similar ghost exit on I-93 above Charles town/Somerville just north of Boston -- in mid-air even -- that was intended to connect the never built inner-ring. Decades later, the new bridges and tunnels of The Big Dig connected to the ghost exit. US-1is routed via the former ghosts iirc. (Originally the through-road and inner-ring were to be I-95 and I-295 or maybe 695, but with cancellation of inner-ring and the Boston to Dedham Great Swamp I-95 segment and deferment of Peabody I-95 connection, the I-93 designation was extended and 95 went around the built ring. Which is why we have a 495 but no 295 and why 95 does not go through Boston as it should.)
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