If you're brave enough to engage them on the issue, I'd stick to one point: bike lanes don't cause congestion (construction does), and removing them won't get cars moving any faster.
I find that one persuasive because a) evidence, b) appeals to drivers, and c) focuses them on wasted spending.
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I find that one persuasive because a) evidence, b) appeals to drivers, and c) focuses them on wasted spending.