I ride my bike in the Peninsula. I personally witness 2-4 accidents monthly ranging from fender-bender/taps to full-on smash-ups. Maybe 2-3 daily is an exaggeration, but they're plentiful. It's a rare day that goes by where the major freeways don't have slowdowns because of wrecks. I'd be surprised if the typical commuter on 101 saw less than 1 per day on average, actually.