Every year, I explore a different area. This year was Excelsior Springs and Liberty. Leaving the lake, I drove east on MO 92 to Excelsior Springs then through town on old US 69, eventually winding up in Liberty.
I noticed in Liberty that part of MO 33 had been decommissioned. I guess the town didn't like the large trucks rumbling down the road (I saw several NO TRUCKS signs).
When I got to old 33 and Main St (aka Route H), I saw the strangest thing: a three lens traffic signal with NO Yellow signal: it appeared to be Red with two Green Arrows.
So I had to stop and take a couple photos just so I could post it on my Flickr page, but while I was doing that, the signal changed to Yellow (!)
My initial reaction was WTF? The it dawned on me: dual LED's in the lenses. That seemed strange to me. Maybe it was cheaper than a 4 Lens set-up with Red, Yellow and 2 Green Arrows?
I saw a similar set-up along MO 152 for a Flashing Yellow Arrow set-up, but it was Red Arrow, Steady Yellow Arrow, Green Arrow/Flashing Yellow Arrow (alternating)
OK, that was different. I assumed all FYA's were a 4 lens set-up (Red Arrow, Steady Yellow Arrow, Flashing Yellow Arrow, Steady Green Arrow).
I have yet to spot this anywhere else besides Liberty, so maybe this is just a local phenomenon.