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I don't know the history of these blue and white mosaic signs, but they must have had standard tile layouts for every letter and digit, as they always were very consistent. I cannot imagine road crews today taking the time for such curbside artistry, but I have always enjoyed these signs as a piece of how things used to be done. They are much more interesting than the standard signs you typically see nowadays.
Next time I get down to Houston, I hope to catch some of these on my own, but in the meantime, thanks to isuredid for this one.