National Highways Authority Of India [NHAI] — fastag purpose defeated

I would like to bring to your notice that the purpose of fastag itself is defeated with manual scan at most of the toll plazas (Ex: plaza name: kozhinjiipatti plaza on travel date 30-dec-18). Not only this, the service person is allowing only one vehicle at a time in the entire etc fastag lane by blocking other vehicles outside.
Why can't this be fully automated?
Why only one lane used for fastag at almost all toll plazas? I see more heavy and lengthier vehicles passing thru' etc lane than on the normal lane.