Originally Posted by milkbaby

A 50 to 100 person ride on those size lanes wouldn't make sense to ride single file as the cars would most likely have to move mostly into the left lane to pass, and to pass a 100 rider long line would take forever. Riding the whole lane actually makes sense to me in this case as it compacts the peleton, is safer, and makes it quicker for any other vehicles to pass safely. It probably also makes intersections less dangerous to navigate.