One South Korean city is testing a wireless technology it hopes can alleviate such problems and perhaps help address one of the biggest challenges facing the Asian country: a stubbornly low birthrate.
In April, the southeastern port of Busan, South Korea's second-largest city, began testing a small, round device called a beacon.
Equipped with a wireless sensor, it activates a pink light attached to another sensor installed on a metal bar next to special priority seats, usually at the end of subway cars. The idea is to alert all nearby that the person carrying the beacon has a baby on the way.
"It is hard to tell if a woman is pregnant, and give up a seat, when she doesn't have a baby bump," said Lee Gyeong-eon, a 23-year-old college student who frequently travels by subway.
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Other South Korean cities also are trying to make travel by public transportation friendlier to pregnant women. Seoul, the capital, has installed bright pink seats designated for women who are expecting.
The Busan experiment is part of the trend toward the "Internet of Things," which uses wireless technology in products not usually associated with internet connectivity, such as toothbrushes or socks.
"I have felt a bit uncomfortable about getting a seat or claiming a seat reserved for pregnant women," said Ock Si-yoon, a 33-year-old who is expecting a baby. "Early on, there is a risk of miscarriage, so I'm a bit uneasy about using public transportation, since subways or busses shake a lot and it is difficult to get someone to yield a seat for me."
For now, Busan's trial of the technology is limited to a few sections of the city's transit system. But the city plans to expand it to more subway lines and to buses.
"Consideration for pregnant women should prevail and they should be able to use public transportation more easily and conveniently with this policy," said Suh Byung-soo, Busan's mayor.