Ponder the red-backed poison frog. In nature, red can issue a warning to predators — stay away, the aposematic message reads. On the road, red can be a warning of its own, often flashing on emergency ...

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Q. What do the flashing blue lights off to the side of the freeway mean? They flash at the end of long poles, perhaps near construction materials. There is one at the Pacific Coast Highway exit on the ...

Cameras with little blue flashing lights are set to be removed from the side of New Jersey highways later this week. The cameras were used to "monitor the conditions" of several highways after the ...