The PRD covers eight prefectures of the Guangdong Province, namely Guangzhou, Shenzhen, Zhuhai, Dongguan, Zhongshan, Foshan, Huizhou (only includes Huizhou City, Huiyang, Huidong, Boluo), Jiangmen and Zhaoqing (only includes Zhaoqing City, Gaoyao and Sihui), and the SARs of Hong Kong and Macau. Geographically and geologically speaking, Shenzhen and Hong Kong are not part of the PRD; however economically and culturally they are considered part of the PRD. The eastern side of the PRD (Shenzhen, Dongguan, Guangzhou) is the most developed economically. The western areas (Zhuhai, Zhongshan, Jiangmen) are open for development. New transport links between Hong Kong, Macau and Zhuhai in the PRD are expected to open up new areas for development and facilitate trade within the region. A major transportation development within the region, the Pearl River Bridge Project, is targeted for completion in 2006. The 29-kilometre Y-shaped bridge will be among the longest in the world. Until approximately around 1985, the PRD had been mainly dominated by farms and small rural villages, but after the economy was reformed and opened, a flood of investment turned it into the mainland's economic powerhouse. The PRD's startling growth was fuelled by foreign investment coming largely from Hong Kong manufacturers that moved their operations into the PRD. In 2003, Hong Kong companies employed 11 million workers in their PRD operations