Abstract: A traffic delineator includes a post having a collapsible, box-like cross-section and a base for mounting the post upright and securing it to a road surface. Inwardly disposed sidewalls of the post collapse inwardly at a bend area when the post is hit by a vehicle, permitting the post to collapse and bend through 90.degree. or more, yet the post self-restores itself to an elongated, unbent position when the vehicle moves away. A base includes receptacle surfaces and pins for engaging and securing the post therein, together with a lower surface configuration enhancing the adhesive attachment of the base to a surface.