Dayun Expressway is the largest expressway

Controlled-access highway

A controlled-access highway is a highway designed exclusively for high-speed vehicular traffic, with all traffic flow and ingress/egress regulated...

 structure in China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

's Shanxi

Shanxi

' is a province in Northern China. Its one-character abbreviation is "晋" , after the state of Jin that existed here during the Spring and Autumn Period....

 province.

It enters Shanxi as the Xuanda Expressway

Xuanda Expressway

The Xuanda Expressway , is an expressway in China which links Xuanhua in Hebei province with Datong in Shanxi province....

 until approaching Datong

Datong

Datong is a prefecture-level city in northern Shanxi Province of North China, located a few hundred kilometres west by rail from Beijing with an elevation of...

 (in northern Shanxi), becoming the Dayun Expressway afterwards. It ultimately ends at Rongcheng

Rongcheng

Rongcheng is a county-level city in Weihai prefecture-level city, Shandong province, in eastern China.-History:According to historical records, the Emperor Qinshihuang had visited Rongcheng twice, building bridges and temples...

 (in southern Shanxi).

The expressway passes through Datong

Datong

Datong is a prefecture-level city in northern Shanxi Province of North China, located a few hundred kilometres west by rail from Beijing with an elevation of...

, Shuozhou

Shuozhou

Shuozhou is a city in the north of Shanxi Province in North China, located on the upper reaches of the Fen River. As of 2004, its population is approximately 1.25 million, and the city has an area of approximately 5,737 square kilometres. Administratively, Shuozhou is a prefecture-level city, with...

, Taiyuan

Taiyuan

Taiyuan is the capital and largest city of Shanxi province in North China. At the 2010 census, it had a total population of 4,201,591 inhabitants on 6959 km² whom 3,212,500 are urban on 1,460 km². The name of the city literally means "Great Plains", referring to the location where the Fen River...

, Lüliang

Lüliang

Lüliang is a prefecture-level city in Shanxi province in China. It has an area of 21,000 square kilometers and a population of 3,600,000.-Administration:Lüliang has direct jurisdiction over:-External links:*...

, Jinzhong

Jinzhong

Jinzhong is a prefecture-level city with 3,249,425 inhabitants at the 2010 census in east central Shanxi province of the People's Republic of China.-Administrative divisions:...

, Linfen

Linfen

-Administrative divisions:The prefecture-level city of Linfen is divided in one district, two cities and fourteen counties. The information here presented uses the metric system and data from 2010 Census.-Pollution:...

, and Yuncheng. Thirty-one counties lie in its track.

It links with the Xuanda Expressway

Xuanda Expressway

The Xuanda Expressway , is an expressway in China which links Xuanhua in Hebei province with Datong in Shanxi province....

 (heading toward Xuanhua

Xuanhua

Xuanhua may refer to:*Xuanhua District , Zhangjiakou, Hebei, China*Xuanhua County , of Zhangjiakou, Hebei, China*Xuanhua, Gaotai County , town in Gaotai County, Gansu, China*Xuanhua, Dengfeng , town in Dengfeng City, Henan, China...

 and ultimately Beijing

Beijing

Beijing , also known as Peking , is the capital of the People's Republic of China and one of the most populous cities in the world, with a population of 19,612,368 as of 2010. The city is the country's political, cultural, and educational center, and home to the headquarters for most of China's...

 or Zhangjiakou

Zhangjiakou

Zhangjiakou, also known also by several other names, is a prefecture-level city in northwestern Hebei province of North China, adjacent to Beijing to the southeast. Its administrative area has a population of 4.35 million, and covers...

), the Jiaofen Expressway (heading toward Fenyang

Fenyang

Fenyang city , formerly as Fenyang County before 1996, is a county-level city under the administration of Lüliang prefecture-level city, in Shanxi Province, China....

), the Yunfeng Expressway (heading toward Yongji

Yongji

Yongji is a county-level city in the prefecture of Yuncheng, Shanxi, China.Yongji had 48,000 inhabitants in 1990....

 and Fenglingdu) and the Yunsan Expressway (heading toward Sanmenxia

Sanmenxia

-Administration:The prefecture-level city of Sanmenxia administers one district, two county-level cities and three counties.*Hubin District*Lingbao City*Yima City*Lushi County*Shan County*Mianchi County*Sanmenxia Development Zone...

 on the Yellow River

Yellow River

The Yellow River or Huang He, formerly known as the Hwang Ho, is the second-longest river in China and the sixth-longest in the world at the estimated length of . Originating in the Bayan Har Mountains in Qinghai Province in western China, it flows through nine provinces of China and empties into...

).

The expressway passes through some interesting historical and scenic spots, such as Yanmen Pass, Mt. Wutai, the old city of Pingyao

Pingyao

Pingyao is a Chinese city and county in central Shanxi province, China. It lies about 715 km from Beijing and 80 km from the provincial capital, Taiyuan. During the Qing Dynasty, Pingyao was a financial center of China...

, as well as many temples.