Those are known as raised pavement markers, or "Botts’
Dots."
Botts' dots may also be called turtles (Washington and
Oregon) or buttons (Texas and other southern states). In many parts of the US
and other countries, Botts' dots are used, along with reflective raised
pavement markers, to mark lanes on highways and arterial roads. 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.
There are an estimated 20 million Botts” Dots in place today
on California freeways and highways.
Botts dots are rarely used in regions with substantial
snowfall because snow ploys damage or dislodge them.
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