Counting methodologies of Greenhouse Gases (GHG) emission in highway life cycle

The processes of Greenhouse Gases (GHG) emissions from highway life cycle are identified. The emissions from whole highway life cycle are composed by the parts of construction and operation periods, respectively, which are greatly influenced to each other. Meanwhile, GHG emissions at highway full periods can be separated into the endogenous and exogenous components, between which is interrelated and not all nonlinear relationship. The formulary of counting methodologies of GHG emission considering the endogenous and exogenous components is built up not only for highway infrastructure construction but also for operation in its life cycle. The model of GHG emission reduction caused by optimization measures is also set up based on the formulary of counting methodologies.