[yt-sdb]

Are you sure? Compare before/after for the main affected regions (Holland Tunnel, Queensboro) versus the unaffected regions. We definitely need more data, but I think there's an immediate reduction in the obvious places.

[blehn]

According to this data, traffic is reduced on the bridges and tunnels but not within Manhattan itself, e.g., going from Hell's Kitchen to Midtown East or Greenwich Village to Alphabet City.

[polon]

You're right...I was only looking at internal Manhattan, but the bridges and tunnels seem to show a significant reduction in transportation times