China's Hong Kong-Zhuhai-Macao Bridge (HZMB), the longest cross-sea bridge in the world, begins operation today. The first bus is ready to cross the bridge. (Photo: VCG)

The first tourists line up and wait for crossing the bridge. (Photo: VCG)

People line up at the entrance of the bridge. (Photo: VCG)

The entrance of the bridge is crowded with people on the first day. (Photo: VCG)

The entrance of the bridge is crowded with people on the first day. (Photo: VCG)

Vehicles cross the bridge one after another. (Photo: VCG)