Establishing the CO2 emission model of carbon neutral road based on gradient

CO₂ emissions from the Chinese transport sector are a growing problem. Highway geometric design is an important part of low carbon roads. Firstly, the factors that influenced CO₂ emission of a road was analysed in this paper, and the gradient is the most significant. Considering proportion of vehicle type, coefficients together with speed, vehicle type and traffic, the CO₂ emission model of a road based on the gradient was established. Furthermore, the function was analysed with the mathematic method, and then the optimal gradient 2%-3% of the neutral road was received . At last, in order to make the calculation of the model to be more convenient, a simple calculated-software was programmed of it. The CO₂ emission of a highway which length is 16km was calculated using it.