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It is an accumulation of oil and other fluids dripping from center under vehicles, and the lighter outer parts of the lane is also scrubbed clean by the tires of the vehicles. When it first rains after a prolonged dry spell, the center of the lane can become quite slippery from this oil wiht water on it. At sharp bumps in the roadway you can see additional oil that is shaken from vehicles, and sometimes there are darker marks from the tires there also...

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17y ago

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