Core Viewpoint - Gansu Expressway (600269) clarified its main business costs related to highway operations, which are divided into maintenance engineering costs and toll business costs [1] Group 1: Cost Structure - Maintenance engineering costs primarily include expenditures for minor repairs and maintenance of road surfaces, subgrades, electromechanical equipment, and bridges, as well as salaries for maintenance staff [1] - Toll business costs mainly consist of labor expenses for toll collection personnel and depreciation of highway assets [1]