Earlier quoted context omitted.
I have a lot of doubts about this. Is this adjusted for location? I imagine people may bike on sidewalks more in dangerous-for-cyclist cities. According to the CDC, most (72%)[1] of bicycle deaths occur outside of intersections, so this may even be an acceptable risk. Most fatal crashes occur near, but not in intersections[2] - biking on the sidewalk completely avoids them. Also, when you're biking on the sidewalk, y…
If you had biked in both places, you wouldn't doubt it. Sure not every autocager sees (or drives as if they see) a cyclist in the road, but the cyclist can see and hear everything around in way that's just not possible on the sidewalk. (I say this as someone who is missing one eye.) Also, cars aren't the only things with doors.
Cars aren't the only thing with doors, but they are the only thing that will door you into traffic. Doors flush with buildings are also quite rare, and are quite rarely opened. (Except store doors - but you don't want to bike near them anyways, unless you want to run into a sign, or a table, or an outdoor display.)