The visibility test object is placed at a distance of 180 metres from the starter and if it is not visible to the station master or the station superintendent, fog conditions are declared.
source https://www.hindustantimes.com/india-news/railways-installs-devices-in-trains-to-assist-drivers-in-foggy-conditions/story-qFgusV0ceaHvLyydywgDQP.html
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