Officers in Shenzhen, in the southern Guangdong province, began the new initiative this month to try to cut the number of pedestrians who dodge traffic on the city's busy roads, the China News Service reports . But they've been facing some resistance to the colour of headgear, because in Chinese culture the expression "wearing a green hat" signifies that a man's wife or girlfriend has cheated on him. The police say the hats are just meant to protect people from the sun, and match the green vests which are also being used.