Doesn't bother the color blind people.

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gray,grey,orange,recycling-is-good-right,sign,signs,woods
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Local greenway trail changed the blazes on the trail from orange to blue, but opted for the inexpensive fix when it came to the wood engraved sign.

Duct Tape Gray

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bumper,duct tape,gray,gray cars
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See? This is why I only drive gray cars. Easy color matching!