An Amber-Colored Conundrum

The Puzzler

RAY: I said, "It's about time." And that was a hint. Why do we see the new LED green lights and red lights, but no new LED yellow lights on? Here's the answer my son came up with, and I liked it.

Most towns are probably replacing these lights on some kind of a schedule. That is, either when the lights have actually burned out or when they're expected to burn out. So, if a typical conventional light is expected to last, say, five years, maybe at the four-year and eleven-month mark they install one of these new LED lights.

But the yellow lights never burn out. They're hardly ever on, think about it. What's on most of the time?

TOM: Red and green.

RAY: Right, and the yellow lights are on for just a few seconds, then they go out. Do we have a winner?

TOM: We do. The winner is Adam Ellsworth from Sioux Falls, South Dakota.

RAY: Where they have one traffic light.

TOM: For having his answer selected at random from all the correct answers that we got, Adam will get a $26-dollar gift certificate to the Shameless Commerce Division of, our esteemed web site. And he can get our new Car Talk middle-age male skin cancer prevention system.

RAY: Is this some kind of medical device?

TOM: No, it's a baseball hat. A nice looking one, too.

[ Car Talk Puzzler ]

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