Abstract: An extrudable one-way roadway marker (11) is provided having enhanced stability. The roadway marker has a constant cross section along a centerline (A--A) that allows the roadway marker to be manufactured by extrusion. The base (13) of the roadway marker has a series of adjacent parallel grooves (19) that provide a large adhesive surface. A downwardly extending gripping edge (14) assists in attaching the roadway marker to a roadway surface. An inclined surface (23) of the one-way roadway marker receives a reflective tape strip (31) that is protected by a lip (29) lying along the upper edge of the inclined surface. A raised rumble portion (15) provides a physical rumbling cue. The parallel grooves form sharp teeth (21) where they join. The sharp teeth project away from the inclined surface of the roadway marker.

Abstract: Roadway markers (11) with large rectangularly shaped bases and a raised rumble portion containing at least one concave curved edge (21, 23) are disclosed. The concave curved edges (21, 23) face oncoming traffic. The concavity may have a constant radius of curvature or may decrease with increased elevation. The height-to-width ratio of the roadway marker and the average radius of curvature are such that automobile tires (41) impacting the roadway marker (11) do not impact the surface of the concavity. Rather, tires (41 ) impacting the roadway marker ( 11 ) hit the marker above the edge concavity. As a result, a gap exists between impacting tires and the surface of the concavity. Water squeezed from a wet tire impacting the roadway marker will enter the gap and wash the surface of the concavity. A reflective tape (31) is attached to the surface of the concavity. In some embodiments of the invention concavities are located in opposite edges of the raised rumble portion.

Abstract: An extrudable roadway marker (11) is provided having enhanced stability. The roadway marker has a constant cross section along a centerline (A--A) that allows the roadway marker to be manufactured by extrusion. The base (13) of the roadway marker has a series of adjacent parallel grooves (27) that provide a large adhesive surface. Downwardly extending gripping edges (19) assist in attaching the roadway marker to a roadway surface. In one form, the sides of the roadway marker have reflective tape recesses (17) for receiving and protecting reflective strips 23. A raised rumble portion (15) provides a physical rumbling cue. A recess (25) reduces the weight of the roadway marker. The ends of the marker can be sheared flat or inclined. The parallel grooves may form sharp teeth where they join. The sharp teeth project away from the center of the roadway marker.