An insert for attaching barricade tape, rope or other flexible line to traffic cones. The insert includes a clip-shaped body having legs that are biased apart to form a jaw area for the tape. The legs are squeezed together by hand and inserted into top openings of the cones. Features on the lower ends of the legs internally engage the upper portion of the cone when released, mounting the insert to the cone with the barricade tape retained in the jaw area.