As Tokyo celebrated the start of the one-year countdown to the 2020 Olympic and Paralympic Games with various events last week, traffic control tests on an unprecedented scale were held to forestall anticipated traffic jams on the metropolitan expressway system, which will serve as the main artery for transporting athletes and Olympic officials.

Along with measures to shield athletes and spectators from Tokyo’s scorching summer heat, steps to curb the likely traffic jams will be key to the success and smooth operation of the games — the preparation for which is well on course a year from the opening ceremony, including construction of event venues as well as recruiting volunteers to assist visitors.

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