There are very, very few mid-intersection traffic signals remaining, but Beacon, New York has kept this signal at the east end of its downtown area at Main and Churchill Streets. It's now just used as a blinker, but C.C. Slater reports that the city refurbished the signal a few years ago. Aside from one missing visor, it appears to be in excellent condition.
These photos were taken in May 2010. The photo on the left is from Churchill Street, looking west toward Main (which curves around the eastern end of downtown Beacon). The photo on the right looks north at Main and Churchill.