 Finally, the Nagano Expressway and the Jōshin-etsu Expressway were built in the Nagano region, and another 114.9 kilometers of roads within Nagano Prefecture were improved.In addition to a transportation legacy, several world-class venues of the 1998 Winter Olympics were built, including M-Wave, Japan's first International Skating Union (ISU) standard indoor 400m double-track, and which happens to be one of the largest hanging wooden roof structures in the world.Finally, the Athletes Village beside the newly constructed Imai Station was built in advance of the Games by the city of Nagano as future public residential housing, and loaned to the Nagano Olympic Organizing Committee during the Games.