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That depends on what type of map you are referring to.

On a weather map it's usually part of a warm front.

On a road map they could be any type of road the cartographer specifies.

On a topographical map they could be elevation lines.

On the Washington Transit Map it's the red line train.

Check the legend and it will more than likely tell you.

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Q: What do the black thick lines on a Geologic map mean?
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