Frontiers research: road and traffic engineering : proceedings of the 2nd International Conference on Road and Traffic Engineering (CRTE 2021) Jiaozuo China 10 12 December 2021 This book contains selected papers resulting from the 2020 International Conference on Road and Traffic Engineering (CRTE 2020) covering Road Engineering and Traffic Engineering aiming to provide an academic and technical communication platform for scholars and engineers engaged in scientific research and engineering practice in the field of Road Engineering and Materials Traffic Engineering and Management and Transportation Engineering. By sharing the research status of scientific research achievements and cutting edge technologies it helps scholars and engineers all over the world to comprehend the academic development trends and broaden research ideas. So as to strengthen international academic research academic topics exchange and discussion and promote the industrialization cooperation of academic achievements