You can barely tell, but the bi-color arrow is lit green. This must've been an early attempt to one of those. The M-250R2 is 250w HPS. Those brown and yellow street name signs were added to most of Cranston's traffic lights in the past few years. CPW seems to like those. The look alright to me.
Fiber optic started being used in the late 1980s and some places still install them. But most are being switched over to dual-color LED fixtures. Fiber Optics use two 12 volt halogen bulbs and transformers. Each bulbs behind a colored lens thats directly behind the fiber bundles that go out to each bead of glass on the front to make up the arrow
I haven't seen any traffic lights with fiber optic arrows in my area, the only thing I saw was 5 light doghouses with yellow and green arrows being installed in early 1989 which replaced 4 section signals that only had a green arrow.
@ Nick; Ahh. RIDOT seems to be a fan of the bi-color arrows over the dog house or straight 5 section signals. Also, if this arrow is fiber optic, i'm convinced the ped signals here are also fiber optic.
@ Tony; it looks similar to one, but it has ridges on the top which intermatics don't and there's no numbers printed on the outside. This M-250R2 may have it's origional PC. just to think that no more than 20 years ago RI was mainly lit by clamshells, M-400, OV-25, M-250R bail latch, and the occasional OV-15 makes me wonder what everyday life was like with remote ballasts clamshells and such in person.
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We also had some green arrow only, 5 section lights and flashing green left turns too.
There is also 3 primary circuits on these poles.
@ Tony; it looks similar to one, but it has ridges on the top which intermatics don't and there's no numbers printed on the outside. This M-250R2 may have it's origional PC.