Abstract: A foldable, collapsible traffic display is storable in the flat, folded state and can be erected to form a three dimensional hollow triangle or box. The apparatus includes three rectangular panels connected together by two folding hinge portions and a holding means for locking the display in its erected state. According to one embodiment, the display includes a balast pocket in the central panel and a Velcro.RTM.-like holding means. An alternative embodiment employs tabs having a special geometry and male and female snap fasteners to lock the display in position. Warning indicia are printed on the panels and the erected display is preferrably oriented during use so that the appropriate warning is visible to oncoming traffic. The display may be turned inside-out and locked in the reverse mode so that the warning indicia on all six panels can be made visible to other motorists.