It's not stop motion Street View except for 5th Ave, but it's stop-motion outside of the computer screen. I don't think he put those pots on a rail.

On Vimeo he says that everything on the computer screen is animated without any replacements. So I'm guessing that yes, it's all just street view.

The first part looks like street-view, but the rest is clearly not - consider the overtaking cars in the tunnel...

Street view is built via a camera mounted on a truck driving on the street. I see no reason that the captured frames wouldn't include normal traffic flows.

That doesn't mean it's actually street view images.

You can clearly see that it's fluid video, not the smudgey, morphing transition used in street view.

Since its stop motion, you wouldn't see the morphing transition, they would wait for that to finish and then take the picture.

Not sure if that is what they actually did, but playing around with it a bit on my own it looks like you could get some decently fluid looking motion by taking screenshots of each "frame" that street view provides.

Have you actually used street view? I have never seen a street with less than 5-20 meters between each position.

According to a quick calculation that would give you a minimum apparent speed of 170 mph. (15 f/s * 5 m/f * 3600 s/h / 1600 mph/m/s)