The textbook speaks of the Megalopolis on the east coast stretching through multiple states and becoming something like a Mega city. Although San Fernando Valley is a part of Los Angeles, it can be considered something like a mini megalopolis between Los Angeles and San Diego. Even though the Valley is part of LA county, it seems like it is its own city that has almost nothing in common with other parts of Los Angeles, but the 405 that connects the Valley to other parts of LA. such as Hollywood, Santa Monica, and Beverly Hills.
Some photos of other parts of the LA area that are nearby the San Fernando Valley along with a picture of the traffic you can expect to be caught in on a daily basis when using the 405 to get to other parts of the city.