Abstract: The present invention discloses a traffic signal terminal compartment which slips directly onto a tenon. The terminal compartment has two 1-½? NPT holes for attaching signal frameworks of different varieties. It proposes a new system for mounting traffic signal lights to a mast arm where the terminal compartment slips onto the tenon on the mast arm. It makes assembly and installation of traffic lights much faster and easier and is more versatile than the standard MAS or MAT mountings that have historically been used.