Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
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. View full size.