traffic signal box

noun2

1. •
   (US, Australia) Any of the large metal boxes containing traffic signal controls, found at roadsides and intersections, and often made available by the local council for artistic work.

   • A caravan installed at the intersection close to the existing traffic signal box contains all the processing devices[…]. — 1976
2. •
   A structure holding traffic lights.

   • At such times, it is hard to define the relative position of the light in the traffic signal box. As we know, in the United States, the red light is on the top and the green at the bottom. — 2008