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Chinese President, Xi Jinping has officially opened the world’s longest sea crossing bridge, nine years after construction first began.
Including its access roads, the bridge spans 55km (34 miles) and connects Hong Kong to Macau and the mainland Chinese city of Zhuhai.
The bridge has cost about $20bn (£15.3bn) and seen several delays.
Construction has been dogged by safety issues – at least 18 workers have died on the project, officials say.
The bridge will open to regular traffic on Wednesday.
The crossing connects three key coastal cities in southern China – Hong Kong, Macau and Zhuhai.
The bridge, designed to withstand earthquakes and typhoons, was built using 400,000 tonnes of steel, enough to build 60 Eiffel Towers.
About 30km of its total length crosses the sea of the Pearl River delta. To allow ships through, a 6.7km section in the middle dips into an undersea tunnel that runs between two artificial islands.
The remaining sections are link roads, viaducts and land tunnels connecting Zhuhai and Hong Kong to the main bridge.
It is part of China’s plan to create a Greater Bay Area, including Hong Kong, Macau and nine other cities in southern China.
The area is currently home to 68 million people.
In the past, travelling between Zhuhai and Hong Kong would take up to four hours – the new bridge cuts this down to 30 minutes.
No. Those who want to cross the bridge must obtain special permits, allocated by a quota system. And all vehicles will pay a toll.
The bridge is not served by public transport, so private shuttle buses will also ply the route. There is no rail link.
Authorities initially estimated that 9,200 vehicles would cross the bridge every day. They later lowered their estimations after new transport networks were built in the region.
There’s been a great deal of criticism of the project.
The bridge has been dubbed the “bridge of death” by some local media. At least nine workers on the Hong Kong side have died and officials told BBC News Chinese that nine had died on the mainland side, too.
Hundreds of workers have also been injured during the construction.
The number of dolphins seen in Hong Kong waters has decreased from 148 to 47 in the past 10 years, and they are now absent from the waters near the bridge, according to the Hong Kong branch of the World Wide Fund for Nature (WWF).
“The project has made irreversible damage to the sea,” said Samantha Lee, Assistant Director of Ocean Conservation at the WWF. “I am worried that the number will never rise again.”
The bridge, surrounding link roads and artificial islands cost a staggering $20bn to build – the main bridge alone cost $6.92bn.
Chinese officials say it will generate up to 10 trillion yuan ($1.44tn; £1tn) for the economy, but one Hong Kong lawmaker cast doubt on that figure.
“I am not so sure either how the bridge can sustain itself if not many cars are using it,” Tanya Chan told BBC News Chinese.
“I am pretty sure that we would never earn that [construction cost] back.”
According to an estimate by BBC Chinese, the bridge will only earn around $86m in tolls per year.
In fact, the bridge’s maintenance costs would already take away a third of this income.
Critics have called the bridge a “big white elephant” that guarantees no economic return. Others have said its main purpose is symbolic, ensuring Hong Kong is physically connected to the mainland.
—-BY BBC, Additional reporting by the BBC’s Lam Cho Wai
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