Three years after the first Botts dots were installed on a California highway, I took this Kodachrome going south on US 101 at the Alto interchange in Marin County, California. This was when it was still a full cloverleaf, with its hair-raisingly overlapping entry and exit lanes below the overpass. Off to the left, Belvedere and Tiburon; to the right, Mill Valley. Again, this is the era of Volkswagen Beetle ubiquity: there are at least three visible here, one in its favorite habitat, the fast lane. | Click image for Comments. | Home | Browse All Photos