Normal bar codes are tens of millimeters wide and carry relatively small information. Here they are talking of few millimeter wide tag with potential of lots more information: http://web.media.mit.edu/~ankit/bokode/
I use the Metro train often. Although not often to commute but I see people using it to go to work and then return home after a tiring day. If they are lucky to get a place to sit, then most often they tend to doze off.
I do not know if they pretend to doze or really do. Nor do I know if they really doze off and miss their destination. What if they had a tag on their forehead requesting the neighbors to wake him/her closer to the destination, would the neighbors oblige and fulfill their social responsibility? I do not know how people will react in Delhi and I want to find out.
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Nehul