With the rapid development of intelligent transportation, the performance requirements for road infrastructure are increasingly increasing. Geocell reinforced soil, as an effective soil reinforcement technology, can improve the stability and bearing capacity of road engineering and play a key role in the operation of intelligent transportation systems. This study focuses on the interface parameters of the constitutive model of geocell reinforced soil structure based on intelligent transportation. By conducting a series of the direct shear tests on geocell reinforced gravel sand, the mechanical behavior of geocell reinforced soil is analyzed in depth. Meanwhile, the Clough-Duncan hyperbolic model is introduced to fit and analyze the experimental results, in order to reveal the interface characteristics and constitutive relationship of soil reinforced with geocell, and to determine the relevant key parameters in the constitutive model. The research results can provide reference for the design of road engineering in intelligent transportation systems and promote the coordinated development of intelligent transportation and geocell reinforced soil technology.