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Went for a few drives along these highways when I was in Tokyo back in 2010. Indeed, an extremely awesome (peerless) big city experience. The expressways snake above, through and below the urban fabric, but are rarely more than 4 lanes wide, so as to not wall-off city sections from each other like the Gardiner/401. Of course, the public transit is extremely efficient, albeit extraordinarily crowded.
Shinjuku station at 830am. Standing outside Shibuya station front at 6pm. Experiences of a lifetime....especially if you like Japanese women.
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