surface 5and embedded in a recess in the center of the treat portion 5 to form a flush surface with the tread surfaces 5s the reflection plate 8 is composed of transparent plastic and the upper surface thereof is provided with non slip protrusions 8a which are idetnical both in configuration and in size with the foregoing protrusions 7 this reflection plate 8 may be so disposed as to extend over the entire surface of the flat tread portion 5a the arrangement may be such that a sheet of large sized relection plate 8 is provided or a plurality of small sized reflection plates 8 are intermittently disposed furthermore conventionally used small and circular reflection plates 9 each having a diameter of b 2 mm or thereabouts may be disposed on both ends of the tread surface 5a the reflection plate 8 may also be fitted to any one of the top and bottom surfaces of the resinous tread layer 10 on the tread portion 5 there are at least two ways in which the reflection plate 8 is integrally attached to the tread portion 5 of the tread member 1 one of the ways is as illustrated in fig6 a 6b to.