This mod is another great release for MM2, also because it's made using the PSDL Road Adder program, expressly developed by Lex_Luther to make this mod, that allows to add new roads and subways. With my experience I can say that the making of a similar mod has been very hard, so, great work to the authors.
This is what Lex_Luther has wrote about this mod.
Here some preview pictures posted by the authors.For the last two years, Icehole and I have been modifying the New York track, making it more fun and also more challenging. We could probably keep working on it for a long, long time, but have decided to release what we have now. We do plan on making a few more changes based partly on feedback from this thread, and then we'll issue the Final release.
You can get this mod from here, from MM2BR and from MMArchive. Soon at MM2X website too. It's an RC1 release.
Please read the Readme file in it to know more and how to use it; to play NYC with this mod you must set all down the traffic density.
It explains also about the problems so this city is known, that are to play it with low polygons cars (at least a maximum of 10000 polygons), set at least a screen resolution of 1024x768 to don't have city loading problems and set the hardware rendering without T&L from the game graphic options.