A channelizer post suitable for delineating traffic lanes, identifying road gore zones, road verges, and pedestrian areas, and the like, is disclosed. While replaceable, the post is normally permanently installed. The post has spring-back capabilities, such that after the post is hit by an object such as a vehicle, the post springs back to a normal vertical position. The post includes a capped tube, preferably formed of an engineered plastic, such as UV stabilized thermoplastic polyurethane (TPU) and a base also preferably formed of an engineered plastic, such as a UV-stable high-impact thermoplastic alloy. The plastics are such that they are weldable together when the post is formed. The cap includes a plurality of holes that allow air to escape from the capped tube when the post is hit by an object and air to reenter the capped tube when the post springs back to its normal vertical position. Molded into the base is a threaded bolt designed to thread into a threaded cup permanently installed in a roadway or other location. Finally, located inside of the vertical component is a kicker tube, preferably formed of the same material as the tube and the cap. All of the plastic components are welded to one another.