This study is interesting but doesn't go very far, with only 5 riders and 10 total hours of riding. As it is the study seems to suggest that total road width is the main factor, as VPD changes with travel lane width on streets that have identical bike lanes. Also, note that "sharrows" in Baltimore are quite inferior to sharrows as they were meant to be, so no valid comparison between bike lanes and sharrows available here. It would be good to see this type of work extended to many more riders, more streets, more cities.