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Photos via The Dude
In case you were wonder what are those markings on the road in several sections of Pacific Coast Highway, they are optical speed bars. According to the California Department of Transportation, "Speed Reduction Markings (also known as Optical Speed Bars) are transverse pavement markings placed with progressively reduced spacing on both edges of the traveled way to create the perception of increased speed. This illusion encourages drivers to slow down as they pass by the markings."
The guidebook also states, "Speed reduction markings should be reserved for unexpected curves and should not be used on long tangent sections of roadway or in locations frequented mainly by local or familiar drivers. Speed reduction markings shall not be used in lanes that do not have a longitudinal line (center line, edge line, or lane line) on both sides of the lane."
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