Abstract on Article from NY Times on New York City to adopt London-style surveillance system designed to detect, track and deter terrorists that would be first in United States; police officials say more than 100 cameras will begin monitoring cars moving through Lower Manhattan by end of this year in beginning phase of project; so-called Lower Manhattan Security Initiative will resemble London’s Ring of Steel, which is credited with helping track suspects after London subway bombings in 2005 and car bomb plots last month; program in New York, if fully financed, will include not only license plate readers but 3,000 public and private security cameras below Canal Street, as well as center staffed by police and private security officers, and movable roadblocks; critics question plan’s efficacy and cost, as well as implications of having such heavy surveillance over such broad swath of city; Police Comr Raymond W Kelly says department has obtained $25 million from city and Homeland Security Dept toward estimated $90 million cost of plan; says operation will cost about $8 million to run the first year.