The BYD F3DM plug-in hybrid, made in China, might be headed south. The Environment Bureau of Hong Kong has purchased two BYD F3DM hybrid cars for testing purposes. The bureau will work together with the equivalent agency in Shenzhen, the nearby city where the car is built, to certify the use and the green credentials of the vehicle, preparing the car for sale in Hong Kong. BYD's reasoning is simple: a car validated by the Hong Kong agency will offer purchasers a more objective assesment of the car's real-life performances and will surely increase the vehicle's reputation. This is something BYD could use after the lackluster sales of the model in China. Hong Kong, for its part, will get cleaner cars that can be used in one of the most crowded cities in the world.