Episode Number : 37br Season : 1br Originally Aired : Thursday, April 2, 2015br br The Tokyo Metropolitan Expressway is the capital city's most important road system. Begun 50 years ago, with a 4.5-kilometer stretch built for the 1964 Olympics, it is today a massive, complex web of roads that runs more than 300 kilometers and carries more than 1 million vehicles per day. Our guest this time is Kenichi Kawabe, an expert on transportation systems and the technology used to build them.