Singapore banned chewing gum in 1992 after discarded gum repeatedly jammed train doors, and officials say the move helped keep the country’s new MRT system running reliably

Singapore is famous for its strict public cleanliness laws, but one of its most talked-about policies was introduced for a surprisingly practical reason. In 1992, the government banned the sale and import of chewing gum after years of dealing with gum litter in public spaces and repeated cases of vandals sticking used gum onto the door sensors of the country’s newly built Mass Rapid Transit (MRT) system.

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