Options that increase the credit for low-income families increase how quickly the credit phases in. My colleagues and I explain here: taxpolicycenter.org/briefs/optio...

Great point. It might well be that a slower speed limit has an add’l, though possibly counterintuitive benefit, of reducing average travel times.

The policy also has a cost, which is not mentioned. Every trip taken at the lower speed takes more time, which has some value. That cost may be small relative to the benefits cited, but it ought to be acknowledged. I’m wondering if that acknowledgment is an important piece of communication as well.