Quote:
Originally Posted by Metro-One
100 years, but I am sure when the time comes they can be maintained for longer, like every other bridge structure in the world.
The West Coast climate is also much more forgivable in general for such structures than pretty much anywhere else in Canada.
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They've actually used this in Ottawa as a way to explain to the public why the city went underground instead of elevated--Ottawa's climate would drive maintenance costs through the roof on elevated structures.