No. There was very little culture shock involved. I really went from not relating in the least with most people in the midwest, to actually feeling like intelligent life really does exist.
Both of you misunderstand. Caltrans built the Arroyo Seco Parkway (Pasadena Freeway) in the 1930s and early 1940s as the third freeway in the nation, first west of the Mississippi. Caltrans was in the process of building a whole network of parkways/freeways at this time, not just one or two, and as a result needed uniform design standards. There were no federal guidelines for freeway design, so Caltrans created their own. When the FHWA was created and began looking at design standards for the rest of the country, they essentially lifted the Caltrans standards, with minimal changes. That's why California freeways have some quirks to them compared to the rest of the country--it would be far too expensive for California to make the minor changes to fit with the FHWA standards, so FHWA allowed them to grandfather in most of the design.
Originally, highway signs were white on black. FHWA was going to adopt the same, until tests showed that white on green is more visible in fog conditions. California eventually converted to a porcelain enamel sign (greater longevity compared to sheeting) of a darker green than the rest of the nation in part because of greater contrast. I can assure you that I find the signs out here easier to read at night than the lighter green retroreflective sheeting used elsewhere, which I find gets washed out in glare at night.
California also invented the 4-Level Stack interchange, at the junction of the 110 and 101 just northwest of downtown Los Angeles.
Caltrans invented the overhead guide signs as we know them today, with lighting, maintenance catwalks, and a mixture of capital and lowercase lettering.
More info: http://www.kriske.com/highway/signs/signs.html