China Southern Power Grid is an important state-owned backbone enterprise managed by the central government, and the State-owned Assets Supervision and Administration Commission of the State Council performs the responsibilities of investor. The company is responsible for the investment, construction, operation and management of the Southern Regional Power Grid, participating in investment, construction and operation related cross-regional power transmission and transformation and interconnection projects, providing power supply service guarantees for the five provinces of Guangdong, Guangxi, Yunnan, Guizhou, Hainan, and Hong Kong and Macau ; Engaged in power purchase and sale business, responsible for power trading and dispatch; engaged in domestic and foreign investment and financing business; independently developed foreign trade circulation operations, international cooperation, foreign project contracting, and foreign labor cooperation. Among them, the transportation facilities (marking lines, sign boards, speed bumps, reflectors, corner protectors, wheel blocking levers), emery and floor paint of the underground garage are designed and constructed by Yicheng Transportation.