Today’s New York Times reports on the fairly ambitious surveillance plans that authorities have forÂ downtown Manhattan:

By the end of this year, police officials say, more than 100 cameras will have begun monitoring cars moving through Lower Manhattan, the beginning phase of a London-style surveillance system that would be the first in the United States.

The Lower Manhattan Security Initiative, as the plan is called, will resemble Londonâ€™s so-called Ring of Steel, an extensive web of cameras and roadblocks designed to detect, track and deter terrorists. British officials said images captured by the cameras helped track suspects after the London subway bombings in 2005 and the car bomb plots last month.

If the program is fully financed, it will include not only license plate readers but also 3,000 public and private security cameras below Canal Street, as well as a center staffed by the police and private security officers, and movable roadblocks.

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The license plate readers would check the platesâ€™ numbers and send out alerts if suspect vehicles were detected. The city is already seeking state approval to charge drivers a fee to enter Manhattan below 86th Street, which would require the use of license plate readers. If the plan is approved, the police will most likely collect information from those readers too, Mr. Kelly said.

But the downtown security plan involves much more than keeping track of license plates. Three thousand surveillance cameras would be installed below Canal Street by the end of 2008, about two-thirds of them owned by downtown companies. Some of those are already in place. Pivoting gates would be installed at critical intersections; they would swing out to block traffic or a suspect car at the push of a button.

Unlike the 250 or so cameras the police have already placed in high-crime areas throughout the city, which capture moving images that have to be downloaded, the security initiative cameras would transmit live information instantly.