Funding for this research was provided by:
National Natural Science Foundation of China (51679004)
National Natural Science Foundation of China (51722802)
National Natural Science Foundation of China (U1834206)
Beijing Nova Program (Z181100006218005)
Research Funds of Henan Provincial Department of Transportation (2017B4)
Article History
Received: 31 October 2019
Accepted: 17 June 2020
First Online: 29 June 2020