A blow-up sex doll is being used as a new form of traffic calming measure in China.Annoyed that local police were not catching speeding motorists outside her home in Ningbo, Lin Chen took matters into her own hands.The 67-year-old bought a blow up sex doll and dressed in sexy red underwear to make motorists slow down to get a better look."There are a set of traffic lights near my house and the cars just shoot through them as fast as they can. It's very dangerous," explained Chen."The police aren't interested so I bought this doll and tied it to the tree."I thought that drivers would slow down if I could give them something worth looking it," she added.Police admit that accident figures have dropped since Chen made the dummy. "It isn't a method we would use, but we can't say it isn't working," said a spokesman.