A traffic barrier delineator apparatus configured for being removably placed through a horizontal hole in a traffic barrier is described. The apparatus is made from plastic and is hollow with a retainer that will retain it in the traffic barrier hole. It is collapsible and will bend if hit by traffic. The apparatus is reusable and replaces industry standard adhesively attached traffic barrier traffic markers. This apparatus allows installation in traffic barriers that have screens or panels on top. This apparatus is far more visible to traffic with various reflective configurations and will not be incidentally dislodged during construction activities. Applications include temporary traffic barriers such as K-rails or Jersey rails, where existing horizontal holes allow the apparatus to be quickly slid into without entering live traffic. Traffic barriers with and without horizontal holes can be retrofitted for this apparatus.