In the 1930’s the Auto Club of California issued a strip map of the route from San Diego to Ensenada.
I bought a copy of the little map on eBay and am going to use it in the Fronteras Cambientas exhibit at the CECUT Museum in Tijuana that opens on February 24, 2012. The opening reception is on March 2, 2012.
Fronteras Cambientas is Changing Boundaries in Spanish
There are lots of very interesting thing to see on the map. One of them is that, based on the size of the city names and confirmed by my research, in 1930 Ensenada was larger than Tijuana.