Dutch cyclist here :-) you slow down a little, look over your shoulder to see whether there is space and move over. If there is a car at slow speed behind you t

Dutch cyclist here :-) you slow down a little, look over your shoulder to see whether there is space and move over. If there is a car at slow speed behind you they see this "look" and typically slow down or make some space as well in anticipation. But if there's a bus at high speed or an asshole when you look over your shoulder, you stop before hitting the door. All of this is easier in Dutch cities with bike lanes and because we cycle much slower than the typical "rider" in San Francisco or London I've seen. Mostly because people commute on old slow bicycles in normal clothes instead of light weight geared bikes and full on sports outfits with helmets.