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Sufficient pavement skid resistance is one of the essential factors to ensure traffic safety. The real contact area ( A r) between the tire and road is significant for understanding and improving the skid resistance performance. In this study, the tire-road contact area is measured by squeezing a smooth underside-dyed rubber block into the specimens, using a self-designed fixture mounted on the universal test machine. The three-dimensional (3D) printing technology is used to separate the specimens with multi-scale roughness. Surface texture on 29 AC pavements is obtained by a 3D scanner and qualified by the root-mean-square surface height ( S q), to investigate the impact of pavement texture on the A r. The skid resistance on 23 AC road sections is measured using the T2GO system, and the pavement texture is recorded, to discuss the influence of the A r on the skid resistance. The results indicate that the multi-scale roughness rarely affects the measured contact area once the concerned wavelength is less than 0.6 mm. The A r decreases with the S q following a power function but has weak correlation with the friction coefficient. This study could provide an in-depth understanding of the tire-road contact and lays a foundation for optimizing the contact-related pavement performance.

Tire–Road Contact Area on Asphalt Concrete Pavement and Its Relationship with the Skid Resistance