The man who invented "cat's eyes"..,.
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"Bott's dots"
In 1953 Dr. Elbert D. Botts, a traffic engineer at the Caltrans materials testing lab in Sacramento, developed a raised pavement marker to help make the painted lines separating lanes last longer. His dots were made of ceramic and glued onto roadways with epoxy. After some refinements, Botts' Dots were mandated for all California freeways, except in areas where they would be damaged in snow-removal operations. But Bott's Dots were not particularly visible at night. In late 1963, after almost four years of research and development, the first reflective version of the Bott's raised pavement markers were installed on the Golden Gate Bridge. Today there are an estimated 20 million dots on California freeways and highways — a lasting legacy to Mr. Botts, who passed away in 1962.
In 1953 Dr. Elbert D. Botts, a traffic engineer at the Caltrans materials testing lab in Sacramento, developed a raised pavement marker to help make the painted lines separating lanes last longer. His dots were made of ceramic and glued onto roadways with epoxy. After some refinements, Botts' Dots were mandated for all California freeways, except in areas where they would be damaged in snow-removal operations. But Bott's Dots were not particularly visible at night. In late 1963, after almost four years of research and development, the first reflective version of the Bott's raised pavement markers were installed on the Golden Gate Bridge. Today there are an estimated 20 million dots on California freeways and highways — a lasting legacy to Mr. Botts, who passed away in 1962.
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