Research on Carbon Emission Characteristics of Large Vehicles and Vertical Slope Optimization Design

Road alignment is closely related to carbon emission of the freeway. The research on the carbon emission of the vertical slope is mostly focused on the one of vertical alignment parameters. However, the comprehensive influence of the combination of the vertical section alignment and the driving state of the vehicle on the carbon emission is rarely published. In addition, research from this perspective has not considered the important premise of road safety. Thus, based on road safety, this research aims to reveal the validate and calibrate the relationship between freeway vertical parameters and the carbon emission of large vehicles. As a result, the carbon emission characteristic model of large vehicles on the vertical slope of freeway based on the Gradient Boosting Regression Tree algorithm has been built. Based on the model, the influence of traffic factors on carbon emission was studied and the analysis of the carbon emission of large vehicles on the vertical slope of the freeway was also revealed, with the variation law of carbon emission of large vehicles in various vertical slope alignment of freeway was mainly studied and analyzed.