Does Beijing Tongda Jingcheng Expressway belong to a third party?

No. A third party refers to an object other than two related subjects. Beijing Tongda Jingcheng Expressway Co., Ltd. is mainly engaged in the general contracting of expressway design and construction, and appears as Party B of expressway construction, not a third party. Beijing Tongda Jingcheng Expressway Co., Ltd. was established in 2004, located in Beijing, and is an enterprise mainly engaged in civil engineering construction with a registered capital of 200 million yuan.