About six years ago, I would drive from San Mateo to Oakland at least twice a week, after work, to meet my then-girlfriend. So that's down 92, across the bridge, and up to Oakland. It's about 30 miles, all on freeway, and at that time of day all in heavy (though not all stop-and-go) traffic.
I don't think I ever saw three separate rear-ends in a single drive. I can't say for certain that I ever saw two. I didn't drive it every day, but I probably did 100 such commutes.
You sound either like you're massively exaggerating or live someplace with apocalyptic traffic.