A vertical panel delineator system is capable of withstanding high winds without rotating from a preferred orientation wherein the full width of the device is perpendicular to the direction of oncoming traffic, is stackable without sticking or jamming, and is capable of accommodating multiple reflective sheeting configurations fully within recessed receiving panels on the delineator device. The vertical panel delineator further accommodates, in a secure manner, warning barricade lights of any known construction, and is uniquely capable of retaining secure engagement of the panel body with its ballasting base when being transported or during ordinary deployment, yet readily disengaging body and base upon impact by a vehicle.