We took CA-36 to Fontana a couple years ago. Missed CA-20 in our newbieness and figured "what the heck?". Going E to W it starts out rough and gets worse by stages. My son went up to the loft after about 15 miles and stayed there quaking the rest of the trip. My wife lost ten pounds sweating. When we got to Fontana, our dog show friends just shook their heads and laughed at us. I know all this has been stated already, but I just want to emphasize the point.
Cheers
Mike