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And also - thanks for the comments and questions!

Ah, I see. The key question the authors look at is what is the impact of adding a lane to VKT - this they found one-for-one growth. They control for many other factors that may hav…

I'm not sure I see the nuance in the two issues you point to. The paper looks at how adding new lanes changed congestion on these roads. The results found no change in congestion, …

The study looked at what is the source of extra traffic. In most cases it was individuals living in the area doing more car trips. Basically, an extra lane temporarily reduces cong…