Why not at Haridwar, Kanpur , Allahabad as well ? Infact sensors should be put at Influence and exit points across its traverse thru all important points  and why can't costs be brought down...?

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Why not at Haridwar, Kanpur , Allahabad as well ? Infact sensors should be put at Influence and exit points across its traverse thru all important points  and why can't costs be brought down...?