AlvinofDiaspar
Moderator
For sure, you have grounds to be skeptical of my argument.
In return I would say (as I have several times in the Gardiner thread): do not worry about the estimated cost differences of the different options. They are of such small magnitude they should not affect your thinking.
But to recap: in terms of capital cost, maintain is cheapest. Even incorporating O&M costs over 100 years and counting the capital costs of partial teardown, the hybrid option is only expected to be a little more. I mean really: a $100 million even with extreme assumptions to torque in favour of tear down. That's nothing. The expansion of night bus service announced this week will cost way more than that! Pretty much everything will.
Let's just stop worrying about the money. It's a red herring.
Except that on top of the capital cost (and btw, I would be highly suspicious when someone tells me that keeping a bridge pushing 50+ years would be, in the long run, more cost effective than removal where that option exists (at that age range, you'd be looking at replacement costs, not simple maintenance - there are reasons why you don't see that many extant elevated expressway at that age). Case in point - the recent bout of Gardiner repairs:
http://www.thestar.com/news/city_ha...way_repairs_to_cost_more_and_take_longer.html
And that's a relatively short turnaround in terms of estimations - not 50 or 100 years ahead for the expressway. Besides, there is the opportunity cost of keeping it up, and that's not captured under the hybrid scenario.
AoD
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