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The North Luzon Expressway's raised plastic transverse rumble strips approaching Balintawak Toll Barrier, Philippines. Rumble strips (also known as sleeper lines or alert strips) are a traffic calming feature to alert inattentive drivers of potential danger, by causing a tactile fuzzy vibration and audible rumbling transmitted through the wheels into the vehicle interior.
A rumble strip can be a series of simple troughs, typically 1 cm (0.4 in) deep and 10 cm (4 in) wide, that is ground out of the asphalt. Other alternatives, similar to the Botts' dots, use raised strips, painted or glued to the surface. A specific form of raised strips using thermoplastic is called profile thermoplastic markings.
Rumble strips only prevent certain types of accidents. This fact is clearly recognized in literature that is widely accepted. You wrote: "rumble strips (shoulder) don't prevent run-off-road accidents". This is incorrect as (shoulder) rumble only prevent run-off-road accidents but only if shoulder is wide and stable enough for a recovery.
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They provide tactile and auditory feedback to drivers when moving across designated travel lanes, and are analogous to rumble strips. Botts' dots are named after Elbert Dysart Botts, a California Department of Transportation (Caltrans) engineer credited with overseeing the research that led to the development of the markers. [2]
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Road traffic control devices are markers, signs and signal devices used to inform, guide and control traffic, including pedestrians, motor vehicle drivers and bicyclists.. These devices are usually placed adjacent, over or along the highways, roads, traffic facilities and other public areas that require traffic contr