I feel that the retention period is 30 days.
The Metropolitan Police Department has introduced the “Last Mile Camera System” to prevent crowded accidents and to quickly respond to incidents during the Tokyo 2020 Games.
This system displays the last mile of each competition venue (the route that the spectator travels by walking, etc. connecting the expected spectator use station and the entrance of the competition venue) and the surrounding situation on a monitor and records them for a certain period of time. .
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