Photo taken on Oct. 24, 2018 shows the first cross-boundary shuttle buse which starts from the Hong Kong Boundary Crossing Facilities and runs to Zhuhai. (Xinhua/Li Gang)

HONG KONG, Oct. 24 (Xinhua) -- The first batch of cross-boundary vehicles on Wednesday left the Hong Kong Boundary Crossing Facilities to drive on the world's longest cross-sea bridge.

The 55-km bridge connects China's Hong Kong Special Administrative Region (SAR) in the east and the Macao SAR and Zhuhai of Guangdong Province in the west.

The Hong Kong-Zhuhai-Macao Bridge is the result of nine years of construction.

It officially opened to public traffic at 9:00 a.m. local time (0100 GMT) on Wednesday.