This model is a vertical 90 degree down-turn bend transition tray. Connects to any ASP cable tray with splice clamps provided. Standard depth is 4" with optional depth of 6". Rectangular Cover,16 x 27 Inch, Flush, Steel Checker Plate, Legend: LIGHTING, Traffic Rated For Continuous Roadway Traffic. Model numbers are 12CTD90 (12" wide), 18CTD90. Ladder Rack Curved Sections (cULus Classified) provide a vertical (plane) change in direction. Cable trays help keep complex technology systems safe and secure without detracting from the appearance of the surrounding environment. From industrial cable management systems to office environments, houses of worship, and even performance. inuous system as well as stand-alone elements.