If I read your posts correctly, you are not advocating for the U2C to run on the Skyway tracks but, rather, you are suggesting the Skyway can continue to be operated in something approximating its current form.
Correct. I'm suggesting an overhaul of the existing system makes the most logic and is more feasible than both conversion to the U2C or an elevated sidewalk.
My understanding is this is not feasible due to lack of support of the current technology or other technology that can "cheaply" operate on the roughly current infrastructure.
This is incorrect. Think of this from an automobile perspective. A road was constructed during the 1980s. You purchased a Pontiac Grand Am to drive on it. 40 years have passed, the road is full of potholes and your rusted out Grand Am is on its last legs. You need a new Grand Am but the manufacturer does not make the vehicle any more. The road needs to be fixed, but the pavement crack rating is requiring a full milling and resurfacing, as opposed to the duct tape maintenance measures used the past few decades. Thus an overhaul (resurfacing) of the road (infrastructure) is needed, along with new vehicles/technology (they don't make Grand Ams anymore).
This is what I'm suggesting. Fix up your aging infrastructure and buy new vehicles, even if they require going to Toyota or Nissan, instead of General Motors.
If I am correct, your options are reduced to U2C, Highline type use or demolition (I can't see the option of a simple abandonment in place making anyone happy).
From my view, an overhaul is an option that should not be eliminated. APMs are still around and aren't going anywhere. It's also significantly cheaper than the U2C as proposed or conversion into an elevated sidewalk (remember, you can't even ride bikes on the Highline).
As I noted, if the Highline isn't feasible, U2C isn't feasible and continuing to run the Skyway isn't feasible, then, 3 strikes and tear it down
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I don't believe the Highline is feasible from a cost or use perspective. I also don't believe spending a half billion to put lower capacity AVs on the elevated Skyway infrastructure makes financial sense and it certainly won't increase ridership. However, I do believe updating the Skyway as an APM, with heavy focus on supportive land use strategies around its stations, is an option that should be explored more intimately.
Help me out here to clarify your position or what technology you think would use the current infrastructure to feasibly allow it to serve as a "transit spine."
My position: Overhaul/update the system + with logical expansion where necessary.
Technology: APM technology, which is what the current infrastructure is designed to support. Raising the infrastructure seems like a non-starter with me. Once you start getting into that, you may be better demolishing the thing and investing in a starter LRT or modern streetcar line.