I NEVER ride two by two. Once in awhile a friend will ride up to tell me something or my husband and I will move up/back to communicate, but when i am with a group I get very annoyed with people who don't follow this rule. When I lead group rides, I am very clear about my expectations for single file. Most of the riding I do is on narrow country roads, but it's still suburbia, with cars. I also see the point of how cars feel; it's not fun to be driving up Strawberry Hill Rd., with several curves and a hill, tons of cyclists and be behind a group that doesn't get in line. Several towns around here have passed new laws about ticketing cyclists who ride side by side and many still do not abide by the rules. On a recent group ride with 50 people, one guy was way out in the middle of the road talking. A pick up was behind him, getting angrier by the minute, since there were so many riders in this group. By the time the truck got to me, he was really pissed and almost ran me and a couple of others off of the road. I don't condone this, but I understand how he felt. I have been known to yell "single file" or "get in line" when people are oblivious.