compounds of tires and that of sand and powdery materials which can be found on highways is sharply higher than that of a conventional material including particles of the hardest material that is corundum crystals curve d 5 the non skid properties of the materials of curves a 5 and b 5 were comparable with those of the materials of curves d 5 and respectively e 5 and f 5 as measured on new and freshly laid down material as soon as the materials were subject to a wear over 150 to 200 microns the scale u of fig5 a substantial drop was experienced in the comparison samples of curves d 5 and e 5 it has been found that such drop is promoted by the fact that as soon as the wear of surface s leads to an uncovering of about one third of the height of the particles most such particles are torn off from material including an elastomeric binder and are lost for anti skid while in the material consisting of the above described polymeric resin most particles which during the progressive wear of the material have been about half exposed over the surface s are still firmly bound to the material and efficiently acting as anti skid elements therefore in the material of the invention the density or population of the spaced anti skid elements does not substantially decrease during wear until actual destruction of the material upper layer further a sharp improvement has been experienced in tests performed by simulating the dynamic action of vehicles travelling at high but currently attainable speed the results of said tests confirmed by actual experimentation on a highway have shown that the vehicle speed has a marked influence in tearing off particles from the material.