WONDERBRAS are set to become bestsellers in Vietnam – because the ruling Communist Party is banning small-chested women from driving motorbikes. Anyone with a chest under 71cm will be outlawed in a bid to make the country’s notoriously hazardous roads safer. The idea is to prevent people who are too thin, too short or too sickly from riding a motorbike, Britain’s Daily Telegraph newspaper reports. Enlarged livers and sinusitis will also rule out aspirant motorists.