reedny
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No doubt Rochester's Inner Loop project has created many benefits: 1) removal of an unsightly sunken highway that divided neighborhoods; 2) restoration of land to the tax roles; 3) addition of bike lanes, parks, public open spaces and other improvements.I did not mean to sound snippy either. I legitimately can't think of a metro area the size of Syracuse (with stagnant population growth) that has invested billions of dollars into a tunnel project. As for cities similar to Syracuse where projects like this have taken place, I think it's a little hard to find examples, because of the uniqueness of the highway cutting literally through the middle of the city. You probably don't find that in too many mid-sized cities.
One somewhat similar example is Rochester and the removal of the inner-loop. Not an interstate and a smaller-scale project, but it's paid off greatly for them, with tons of new investment in downtown.
Don't think Buffalo can remove a highway? Rochester did.
New Haven, CT is in the process of a similar project:
New Haven’s Downtown Crossing plans advance
And a good all-encompassing article from the Business Journal on highway removals
American highways are so expensive that cities are tearing them down — here’s what they’re turning into
But the loop is not an I-81 analog. Per the links in your post, it was not heavily used so there was no "hit" to East-West (I-490) by-pass traffic. I-81, by contrast, is a major artery connecting Canada and the north country to PA and other points South (along with serving Syracuse suburbs). 481 is there, but it's pretty far to the East and doesn't seem configured to be a viable I-81 alternative.
It's a complex issue, but clearly all New York tax-payers (and highway travelers) have an interest in it, not just Syracuse residents. While the "community grid" option has gained popularity (fueled mostly by local residents and businesses), for the rest of I-81 users (maybe the majority), I hope CG is not a barrier. If it's a workable by-pass (481), I hope it's not too much of a compromise. If it's an unworkable by-pass or an off-highway diversion (like Shamokin Dam), not good. That could funnel North/West-South/East traffic off an expressway into signaled intersections and delays. Those who have gotten hijacked at Shamokin Dam trying to get to the DMV via Route 15 will know what I'm referring to.
Central Susquehanna Valley Transportation Project - Wikipedia
Please be gentle in responding.

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