A traffic marker assembly, comprising: a marker body comprising walls formed of moulded plastic, a top portion, and a base portion, the base portion comprising a circumferential flange; a base comprising a moulded material and having a centre aperture therein for receiving the marker body when the marker body is joined to the base, wherein the circumferential flange of the marker body has a greater diameter than a diameter of the centre aperture of the base, so that the marker body can be removably joined to the base to form the traffic marker assembly; a plurality of circumferentially spaced interlocking protrusions disposed on the wall of the marker body, the interlocking protrusions being located so that they engage an interior circumference of the base when the marker assembly is in an assembled state, wherein the plurality of circumferentially spaced interlocking protrusions are also located so that when a plurality of said marker bodies, without attached bases, are stacked together, the protrusions on a lower marker body interferingly contact an inner wall of a marker body stacked thereover in order to stop further advancement of the upper marker body over the lower marker body, thereby preventing sticking of the upper marker body on the lower marker body; and characterized in that there are provided: a plurality of diamond-shaped protrusions disposed in spaced circumferential relation about the marker body, each said diamond-shaped protrusion being disposed between adjacent interlocking protrusions, wherein the diamond-shaped protrusions function to press the base away from the marker body, thereby causing the base to deform toward the interlocking protrusions to improve locking of the base to the marker body, both axially and rotationally. a marker body comprising walls formed of moulded plastic, a top portion, and a base portion, the base portion comprising a circumferential flange; a base comprising a moulded material and having a centre aperture therein for receiving the marker body when the marker body is joined to the base, wherein the circumferential flange of the marker body has a greater diameter than a diameter of the centre aperture of the base, so that the marker body can be removably joined to the base to form the traffic marker assembly; a plurality of circumferentially spaced interlocking protrusions disposed on the wall of the marker body, the interlocking protrusions being located so that they engage an interior circumference of the base when the marker assembly is in an assembled state, wherein the plurality of circumferentially spaced interlocking protrusions are also located so that when a plurality of said marker bodies, without attached bases, are stacked together, the protrusions on a lower marker body interferingly contact an inner wall of a marker body stacked thereover in order to stop further advancement of the upper marker body over the lower marker body, thereby preventing sticking of the upper marker body on the lower marker body; and characterized in that there are provided: a plurality of diamond-shaped protrusions disposed in spaced circumferential relation about the marker body, each said diamond-shaped protrusion being disposed between adjacent interlocking protrusions, wherein the diamond-shaped protrusions function to press the base away from the marker body, thereby causing the base to deform toward the interlocking protrusions to improve locking of the base to the marker body, both axially and rotationally.