today, there are more than 25 million botts' dots in use in california, though they have started falling out of favor. in 2017, caltrans announced that it would stop using botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars. reflective lane markings will be wider and thicker, providing some of the tactile feedback the botts' dots provided. in california, highway lanes may be marked either solely by botts' dots, or dots placed over painted lines. four dots are used for broken lines on freeways, and broken lines on surface streets may use only three dots. reflective stimsonite pavement markers are placed at regular intervals between botts' dots to increase the visibility of lane markings at night. in the las vegas area of southern nevada, roads with multiple lanes use four pavement markers for each broken white line, a reflective stimsonite marker followed by three botts' dots.