The East and West Chang'an Streets were built as part of the Imperial City of Beijing. East Chang'an Street originally ran from the Left Chang'an Gate (on the east side of the square before Tian'anmen gate) to the Dongdan gate, and West Chang'an Street originally ran from the Right Chang'an Gate (on the west side of the same square) to the Xidan gate. The north side of the square, between the two Chang'an Gates, became a road after 1912 and was named "Zhongshan Road", after Sun Yat-sen. In 1940, the Inner City wall was breached at Jianguomen and Fuxingmen respectively, due east and west of the ends of the East and West Chang'an Street. Streets extending from the ends of the two Chang'an Streets were widened to become Jianguomen Inner and Outer Streets and Fuxingmen Inner and Outer Streets. The two Chang'an Streets thus became part of a major thoroughfare into and out of the Inner City, now considered the "extended" Chang'an Avenue. The two Chang'an Gates were demolished in 1952 to expand Tiananmen Square, after which the two Chang'an Streets and Zhongshan Road were merged, becoming a singular "Chang'an Avenue".
Chang'an Avenue is the road directly before Tian'anmen gate and to the north of Tian'anmen Square. Because of its location, Chang'an Avenue has been associated with a number of important events in Chinese history, such as the Tian'anmen Square protests of 1989 (including the famous confrontation of the Tank Man), the May 4th Movement and the funeral procession of Zhou Enlai. During important celebrations in the People's Republic of China, military parades are conducted on Chang'an Avenue, with the procession travelling from East to West along the avenue, passing before Tiananmen gate. For this reason, the avenue is surfaced with reinforced concrete, to prevent tanks and other heavy vehicles from damaging the surface.
Because of its sensitive location, special regulations apply to Chang'an Avenue. For example, trucks and freight vehicles are banned day and night,[7] and no commercial advertising is allowed on the street.[8]
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Note: This article considers Chang'an Avenue as the major through road from the W. 5th Ring Road through to the E. 5th Ring Road, which defines larger urban Beijing.