The present invention is directed toward a transition splice that joins a cable tray and cable basket to form a cable routing system. The cable tray and cable basket each include a plurality of longitudinal wires and a plurality of transverse wires. An end transverse wire of the cable basket is positioned adjacent to an end transverse wire of the cable tray. A plurality of the longitudinal wires of the cable tray and the cable basket are aligned to form a pathway. The transition splice is secured to an end of the cable tray and to an end of the cable basket to maintain the pathway for routing cables thereon.