We keep drifting from the original question into being pro or con regarding infrastructure.
The question is a pretty straightforward one, and worthy of discussion if we're discussing spending priorities.
There's a decent correlation between infrastructure and ridership, but that doesn't by itself demonstrate causality. Nor does it give any indication of where we might expect the biggest benefit (for purposes here defined by me as more riding/less driving). It also doesn't show whether the added numbers of bicyclists are ex-drivers, or have traded mass transit for bicycles.
IMO intelligent discussion about infrastructure shouldn't be simply Pro or Con, but about how to get the best improvement (define for yourself) for each dollar spent.
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