Neronium said:
I would rephrase the statement as this:
People in California
do not know how to drive.
In this state, nobody knows how to stop (there is a reason it's called a "Californian roll"), how to use roundabouts ("oh god, what is this round thing? Do I turn left? Right? Can I drive over it?), how to yield ("It's only a suggestion"), or how to follow the speed limit ("But officer, I was only going ten miles faster!")
The last one is important, because, when we are not caught in the grid lock of "rush hour," nobody follows the posted speed limits, unless we see a cop. In normal weather conditions, this isn't really a problem.
In the rain, all bets are off.