As expected, dynamic friction coe$cient decreased as the speed at the interface and the glycerol content in contaminant were increased due to the hydrodynamic lubrication e!ect. The correlation between the surface parameter and the measured friction at the glycerol contents of 70 and 85% was higher than that at 30 and 99% glycerol contents. Among 22 surface parameters evaluated in the correlation, *! had the highest correlation with friction for most of the test conditions with neolite. For Four S rubber, the parameters related to the surface void volume appeared to have high correlation with the measured friction coefficient at 30% glycerol content. As the glycerol content was increased to 70 and 85%, the surface parameter related to the deformation of the footwear material appeared to correlate highly with friction for Four S rubber. As the glycerol content was increased further to 99%, the surface parameters related to the peak to valley distance became more correlated with friction for Four S rubber. A good indicator of the tile slip resistance probably should consist of the surface parameters representing the surface slope, the surface void volume and the surface peak to valley distance. The coefficients in this indicator should be determined by the system parameters including the tile and footwear materials, the measurement method for slip resistance, and the contaminant, the contact force and the speed at the interface.