A cable tray cover for a substantially U-shaped cable tray having a base portion and two opposing sidewalls extending upward generally perpendicular to base portion. The cover includes a plurality of interlocking cover panels for covering cable carried by the cable tray, with each cover panel having a top side, with a first end and a second end, with each cover panel configured to extend transverse across the tray. The first end of each cover panel includes a hinge point to allow the second end of the cover panel to rotate and overlap the second end of an adjacent cover panel for use in a radius section of the cable tray. The cover panels may include a hinge slot and a hinge tab, wherein the hinge tab of a cover panel may be placed through the hinge slot of an adjacent cover panel to form the hinge point.