If you drive over it regularly, rig something up that can spill/spray a relatively small amount of black paint onto the road before or on it. It won't be any identifiable event, but it will relatively quickly be covered in black paint.
If you drive over it regularly, rig something up that can spill/spray a relatively small amount of black paint onto the road before or on it. It won't be any identifiable event, but it will relatively quickly be covered in black paint.
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