It’s like the TV show 24: at 6:28 pm the car appears on video. Two minutes later the T-shirt vendor gets suspicious, finds a convenient mounted policeman who sees the fireworks and propane tanks and clocks inside and decides, at 6:33, to evacuate Times Square.
If it had been 24 Faisal Shahzad would have been arrested at 11:45 that night, but in our real world two nights later is just as good.
That’s pretty impressive counter-terrorism. I’m sure, though, that Glenn Beck and Rush Limbaugh and John Yoo will find one thing missing.