September 1, 2011, Tokyo, Japan - Japanese traffic police officers cordon off a major junction where all vehicles inbound for the city are halted during an emergency drill in Tokyo on Thursday, September 1, 2011. Drills were held throughout Japan with some 517,000 people participating in 35 prefectures, in the first such mass exercises since the catastrophic March quake and tsunami hit the country's northeast. (Photo by AFLO) [3609] -mis-