Nice! 8" signals are super rare and doghouses were really never used in RI. I do know one intersection that uses a doghouse for whatever reason (once in a while RIDOT installs something way different from the norm, probably to test it out or whatever) but RIDOT's go-to guy was the 12" four section RYG with a bi-color arrow. Those things were used widespread here since probably the 80s or maybe even earlier. The original ones here were halogen with fiberoptics. Some are still in use today. Then they switched to LEDs with the exposed diodes, center row of diodes was yellow and the outer two were green. Then they moved to the "incandescent-like" ones. The fiberoptic ones only have one row of "diodes" shared by both colors. RIDOT was also big on the single-section 12" fiberoptic ped signals too, with the "WALK" being both orange and white, with DONT lighting up with the orange WALK to obviously form DONT WALK. Here's one of the fiberoptic bi-color arrows. When they switched the ball lights to LED they kept the halogen bi-color units. There's only two I know of off-hand anyway, and they're neighboring intersections. Here's the other one I know of, this one was caught lit up (but only from far away) and you can see how dim it is. The green is very drab too. I'd imagine the color card has faded after umpteen years. I absolutely love the fadeout though.

Those doghouse signals are common as muck in Georgia, USA area