What are those mystery metal strips found on roads? - General

I find these metal strips all the time on the side of the road, usually next to the curb. Mostly on major roads, but in neighborhoods too sometimes. They’re about 6-8 inches long, 2 mm wide, and 1/4 mm thick. Appears to be steel, but just low grade steel, not spring steel. Just curious, anybody know what they are?

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