Quote:
Originally Posted by Dengler Avenue
Fair enough. I think two of the 401 overpasses around Milton are replaced likewise too.
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That's pretty much the standard way most overpasses are replaced to be honest. In lower traffic situations, lanes can be closed, part of the bridge can be demolished and subsequently be replaced.
In situations with higher traffic levels, you can narrow lanes a little bit, and reduce the shoulder width to demolish part of the bridge first, but otherwise you pretty much just have to build a new bridge beside the old one.
That's why bridge replacement projects and major rehabilitation work is so often tied to highway expansion projects. You have to move the traffic off of the old bridge to repair or replace, so you might as well do that as part of the work to expand the highway anyways.
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