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The concepts of transport mode energy consumption and road network capacity are explained in the paper, which are applied to forecast the minimum energy consumption in a Meg polis. A bi-level optimization model is used, where upper-level establishes energy consumption consistent with the maximum road network capacity, while the lower level assigns traffic demand across the network. Modal split and the capacity models of vehicle roads are used to connect the two levels. The idea and method can be applied to the process of urban traffic planning so as to promote the sustainable development of urban transportation and environment. When traffic demand is more than traffic supply, transport structure can be adjusted according to the value of energy consumption by traffic modes.