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Botts Dots, or “round raised pavement markers” are small bumps lining the centerline or edge line of a roadway. They are often used on curves where vehicles have a tendency to deviate outside of the proper lane, risking collision. Rumble strips are closely spaced raised pavement markers at regular intervals on the roadway that create noise and vibration to the vehicle. Rumble strips can be used to warn drivers of a change in speed limit, before pedestrian crossing, leading up to a residential or school area, and upcoming stop sign or intersection. Rumble strips should be used only in areas where the noise impact would be minimal.
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