The common thread amongst those roads seems to me to be the probably high incidence of distracted and/or stressed-out drivers on them, coupled with the large usage by cyclists. I hope the focus of further discussions about the recent accident will be directed toward drivers, not cyclists. Drivers talking on the phone, eating, rubber-necking, fiddling with the radio, looking at the beautiful sights, putting on cosmetics, not using their turn signals, improper lane usage, not stopping at signs, running yellow and red lights, driving too fast for conditions, reading as they drive, and (with all due respect) driving too old.

Not to let cyclists off the hook, we must follow the rules of the road for vehicles, and only revert to pedestrian riding when absolutely necessary (and then only with extreme caution and respect for the actual pedestrians). There's nothing dangerous about the roads mentioned above.