Solid pavement marker

A solid reflective pavement marker includes a solid body having a base, a top wall parallel to the base, an end wall extending between the top wall and the base, and a side wall extending between the top wall and the base. The base, top wall, end wall and side wall are integral and formed as one solid piece from a thermoplastic material mixed with a gas liberating material. The solid reflective pavement marker also includes a reflective member fixedly attached to the end wall. The method of making a solid reflective marker includes the steps of melting a thermoplastic material by applying heat and mixing a gas liberating material with the thermoplastic material. The method also includes the steps of injecting the material mixture into a mold having a predetermined shape of a body of the reflective solid marker, wherein the body includes a base, a top wall parallel to the base, an end wall extending between the top wall and the base, and a side wall extending between the top wall and the base, the body having a bore extending partially therethrough from the base; and cooling the mold.