If You Squint . . .

. . . “Ground Zero” is almost an anagram of “Green Zone”:

According to a 36-page presentation given by top-ranking police officials in recent months, the entire area would be placed within a security zone, in which only specially screened taxis, limousines and cars would be allowed through “sally ports,” or barriers staffed by police officers, constructed at each of five entry points.

Roughly a dozen guard booths would be established at street corners where pedestrians or vehicles are most likely to enter the area, while the western lanes of Church Street would be reserved for emergency vehicles.

All service and delivery trucks for the trade center site would be directed to an underground bomb screening center at the south side of the complex. Tour buses would drop off and pick up passengers at Liberty and Greenwich Streets. But no bus would be summoned from the underground security center and garage until all the passengers are present, a requirement that could leave large clots of tourists waiting for stragglers.

The plan is designed to prevent a third terrorist attack on the site, said Paul J. Browne, deputy police commissioner for public information, and, he said, would have little effect on either traffic or pedestrians. It is among the more striking features of the Police Department’s overall plan for Manhattan security, which also includes measures to photograph every vehicle entering Manhattan, and scan its license plate, and then keep the information on file for at least a month. The department hopes to have the plan in place by 2010, by the time Mayor Michael R. Bloomberg leaves office.

Landlords, company executives, public officials and some urban planners acknowledged the need for security at ground zero, but worried that the procedures would undermine the effort to reweave the trade center site into the city’s fabric. They fear that the proposed traffic restrictions could create tie-ups in a congested neighborhood and discourage corporate tenants from renting space, or shoppers from visiting the stores in the area.

. . .

The security zone would extend west from Church Street, between Vesey and Liberty Streets, and include portions of several adjacent blocks.

Mr. Browne, addressing criticism that the security plan would undermine a normal commercial and cultural life in the neighborhood, said, “I think this will reassure people that this is probably the safest business environment anywhere.”