As a result, a rare bridge construction scheme was born: artificial islands were built on the sea surface, that is, bridges were connected to artificial islands, and artificial islands were connected to tunnels.

Although Denmark and Sweden are only 16 kilometres across the strait, their cultures are very different.

They have different languages, different ways of behaving, different currencies, different road signs, different traffic rules, cars travel in different directions before 1950, so do trains, Danish trains come from the right and Sweden from the left, and the locomotives have different voltages and radio frequencies.

Engineers had to design a digital compiler to exchange information between different fire shops, create a standard terminology system to unify verbal instructions, design a device that could convert locomotive voltage from 25,000 volts to 15,000 volts, and test empty trains before all trains were put into operation.

The last section of the bridge was connected on 14 August 1999.

Crown Prince Frederick of Denmark and Princess Victoria of Sweden meet in the middle of the bridge to celebrate its completion.

The official inauguration took place on 1 July 2000 under the auspices of Queen Margrethe II of Denmark and King Carl XVI Gustaf of Sweden.

Before the bridge was opened, 79,871 runners took part in a semi-marathon called Broloppet (Running on the Bridge) on 12 June 2000 from Amager in Denmark to the Swedish province of Skåne.

At first, the use of the bridge was not as high as expected, mainly due to the toll collection of the bridge. But in 2005 and 2006, traffic on the bridge increased dramatically, mainly because many Danes bought houses in Sweden and worked in Denmark, where housing prices were much lower than in Copenhagen.

In 2006 a car crossing the bridge was charged 235 DKK, 290 SEK or 32 euros (however, frequent users of the bridge received a discount of up to 75%). In 2004, nearly 17 million people used the bridge, of which 10.6 million were vehicles and 6.2 million were railways.

The Oresund Strait Bridge (also known as the Oresund Bridge) connects Copen

Construction began in 1995 on Hagen and Malmö, Sweden's third largest city. The 10th largest bridge in the world. The bridge is 16 kilometers long and consists of three parts: an undersea tunnel on the west side, an artificial island in the middle, and a sea-crossing bridge.

The undersea tunnel on the west side is 4,050 meters long, 38.8 meters wide and 8.6 meters high, located 10 meters below the seabed and consists of five pipelines.

They are two train tracks, two two-lane highways, and an evacuation corridor. It is currently the most spacious undersea tunnel in the world.

The artificial island in the middle is 4,050 meters long and connects the two sides of the project. The sea-crossing bridge on the east side is 7,845 meters long, the upper is a 4-lane expressway, the lower is the opposite train track, a total of 51 bridge piers, the middle is a cable-stayed bridge, the span is 490 meters, the height is 55 meters, it is the largest load-bearing cable-stayed bridge in the world at present.

The Øresund Bridge was completed in June 2000 and officially opened to traffic on 1 July. The investment in the project will be recovered through the collection of bridge tolls. The Øresund Bridge received the "Outstanding Construction Engineering Award" from the International Association of Bridge and Building Engineering.

It is used to reward its achievements in terms of construction period and environmental protection.

The opening of the Øresund Bridge has made the dream of the people of Sweden and Denmark for nearly 100 years a reality. The city of Copenhagen is separated from Malmö in Sweden across the Øresund Strait and was one of the busiest waterways of the 20th century.

According to statistics, in 1956, 11 million passengers passed through the Øresund, and in 1967 it reached 24 million. The budget for the construction of the Orsun Bridge was DKK 21 billion at 1990 prices.

After the bridge is completed and opened to traffic, it is expected that the daily traffic flow will be 10,000 vehicles, and the design capacity of the tunnel will be 30,000 vehicles per day, and the traffic flow can continue to increase by 50% after the ventilation capacity is improved.

Since 1886, experts from Sweden and Denmark have proposed a plan to connect the straits, but whether to build a bridge or a cross-sea bridge has been studied and verified. In 1991, Sweden and Denmark formally signed an agreement to build the bridge.

A toll of DKK 230 is required per car. If you buy a monthly pass, you will have to pay 3,400 CZK per month. Some drivers think the tolls are too high. Some drivers believe that overtaking is not allowed on the bridge, which affects the speed of the vehicle, so they prefer to cross the Øresund by ferry from other places.

The designers of the bridge hope that the bridge will also create a place called the Oresund region, which is made up of communities from Copenhagen and Sweden in Denmark. This area is located on the eastern side of the Strait and forms the largest metropolitan area in all of Northern Europe. The designers also wanted the site to be a centre of economic activity.

One of the obstacles to economic integration is the lack of a single currency, as both Sweden and Denmark keep their own currencies, the Swedish krona and the Danish krona, respectively. Although the two currencies are interoperable in some places between the two countries, the exchange rate is not attractive. And many transactions, especially those that are not in tourist areas, do not accept other currencies.

Another obstacle is the lack of coordination in areas such as taxation and social welfare. People who travel between the two places often fear double taxation and losing out on the benefits enjoyed by the unemployed, as the foreign companies do not subsidize the local government.

At the same time, for this reason, many people are worried that their children will not be able to attend kindergarten. Most of these issues have been resolved after discussions between the two countries.

Before the official opening, the two countries held a grand celebration ceremony. The bridge is known as the "bridge from Sweden to Europe".

The opening of the bridge will make the Nordic region one of Europe's leading centers for education, research and business, with 11 million passengers passing through the Øresund, up from 24 million in 1967.

As a result of the construction of the Øresund Bridge, Copenhagen International Airport has carried out a number of ancillary works, such as the expansion of the airport, the construction of roads and railways connecting the city center, the construction of a new international train station, and a series of infrastructure construction to further enhance the visibility of Copenhagen International Airport and expand the flow of passengers and goods, and strengthen the relationship between the two countries and the European continent.

After the completion of the Øresund Bridge, the eastern part of Denmark and the southern part of Sweden will become the most densely populated, economically active and culturally active region in Northern Europe and the Baltic region.

The main span of the bridge is one of the longest cable-stayed bridges in the world, measuring 490 meters. The pylons are 204 meters high, and the bridge is 7,845 meters long, about half the distance between Sweden and Denmark, and weighs 82 million kilograms.

The rest of the distance is on the artificial island of Peberholm (Pepper islet), which is 4,055 meters long.