I have a guess-- but it is only a guess-- why that one intersection might have a traffic light. It could be because horse trailers hitched behind trucks headed to the Polo Fields would have difficulty with the roundabout turns. If they enter TV from 466, turn north on Buena Vista and then left into the Polo parking lot, they would not have to navigate any roundabouts.
... Did I mention that this is just a guess.
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