Abstract: A spacer is shown for spacing a post from a rail used alongside a road. The spacer is formed from an injection-molded plastic honeycomb structure. The honeycomb structure has a number of substantially parallel, internal webs, with the internal webs extending in a direction substantially perpendicular to the post and the rail. The spacer can be formed with a post-interfacing side of the spacer having a stepped configuration that allows the spacer to engage with a variety of different shaped posts. Each of the substantially parallel internal webs of the spacer is provided with the stepped configuration at the post-interfacing end of each of the webs. A width of the bottom surface of the stepped surface is selected for engagement with a standard width flange on an I-beam type post. A width of an intermediate ledge surface on the stepped surface is selected for engagement with standard wooden square posts.