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Originally Posted by geoff's two cents
2) Deasine's suggestion that we consider a streetwall for the viaducts. I think this could be done while preserving the soon-to-be Abbott streetwall below, provided the building designs were creative enough. Eventually (years down the road, so to speak), we might consider losing a lane or two on the 'ducts to create something of a parkway w/ plantings, bike lanes, etc. Retail would be an option, as would staircases connecting to the street and park below. This would entail incrementally reducing road capacity, while preserving the existing shortcut into downtown that the 'ducts make possible. The result would be an intensely interesting and unique, multi-layered yet not enclosed, urban space. I'd be interested in hearing what others think of this.
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It wouldn't be cheap I have to admit, but notice, taking apart the viaducts won't be cheap anyway, especially since much of the buildings west of Carrall are integrated into the viaducts already. Just to note, developers would be footing the bill for their buildings, and not the City. The city, of course, would have to pay for the park extension (that price varies depending on its size), access points to the viaducts, etc.
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Originally Posted by geoff's two cents
For a contrary perspective, I imagine Thom's response to the (justified) criticisms above regarding the expense entailed in moving the Skytrain viaduct would be that the reason this is a problem now is because we awkwardly constructed our high capacity rapid transit infrastructure around the viaducts in the first place. Had we made the necessary changes to our road infrastructure in the early 1980s (redesigned them, that is, or torn them down), we wouldn't be in this spot today. The solution, then, is to cut our losses, learn from our mistakes, and quit organizing our city planning around a soon-to-be obsolete quasi-freeway viaduct. Our roads should be made to work for the city, not the reverse.
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Should the viaducts be taken apart, I don't think the SkyTrain guideway would pose any problem in terms of the livability and development. The guideway, however, would be an issue for those "on-ramps" and "off-ramps" Megg was mentioning. I've pointed out earlier in the thread, as per quoted post below, that these ramps should only have a maximum grade that trucks can handle: the viaducts are part of the trucking road network.
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Originally Posted by deasine
Let's just use that calculation. The building height of GM Place, as provided approximately 39 metres. Because I can't find any information about the height of Georgia Viaduct, I'm going to use a 3D rendering of GM Place on Google Earth, the viaduct is about halfway, so 19.5 metres, not unbelievable. From Beatty Street to Expo Boulevard, the distance is approximately 150 metres.
M=∆y/∆x = 19.5/150 = 0.13. Quite steep in general, and very steep for trucks to handle, should it still be a truck route. Even if it's 15 metres high (the viaduct), that's 0.10, which is still steep.
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Notice, the off-ramps, from Beatty to Expo on Dunsmuir, would be a grade change of 13%. Keep in mind, this means there will be no access to Citadel Parkway. To keep Citadel Parkway and maintain a gradient change of 10%, which is quite steep even for regular cars, assuming the viaduct is 19.5 metres above the ground, the off ramp would have to be 195 metres long from Beatty. Notice, this off ramp would cut access off Expo Blvd. If you extend it so that it the off ramp starts after Expo Blvd (thus maintaining GM Place integration), the SkyTrain guideway would be in the way. Even with on-ramps and off-ramps, installing these also contribute to the cost. These on-ramps and off-ramps is just like reducing the visual impact of the viaducts, but they are still there.
Keep in mind, I never said removing the viaducts won't improve the "livability" of the residents in that specific neighborhood, and heck, I can care less if drivers are going to have a 4 minute longer commute to their time, but I just question the cost of this project. At what expense? What is the plan for the new configuration? How does this change affect existing and planned developments? The cost of this project will be incredibly high, and the City of Vancouver has a list of higher priority projects than this one, namely the downtown streetcar and waterfront transit hub and development extension and integration.