A portable sensor prods riders to do the right thing and give up their seats

It is always difficult to figure out if a seat should be forfeited to someone else on a train. Trains and subways everywhere are packed with people and it is easy to miss opportunities to assist the physically handicapped or elderly. Busan, a major city in South Korea, is attempting to create a solution to this problem by implementing a bluetooth system in its subways. The system informs passengers if a pregnant woman is on the train through a bright pink light attached to the poles.

The light goes off thanks to portable sensors that have the Bluetooth capabilities to send signals. The portable sensors are usually on a woman's bag and immediately connect to these pink lights. In turn, a passenger seated sees this blinking light and can choose to give up their seat. Pregnant women can pick up this little gadget and leave them on their bags for six months before it runs out of batteries.

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