No, not plow through the group. But when the light turned green I would expect to move out into the intersection. It would depend on the speed & density of the cyclists how I would do this. If it was me on the bike I wouldn't do this regardless of whether it's the norm. Consider the driver who is coming up to the green light at the speed limit, chatting on a cell, not expecting to have a need to stop because the light is green. It's crazy to think that because you want to keep an obviously unmanageable number of cyclists together you expect everyone else to wait while you clear intersections on a red light. btw, would you blow the red if there were cops on the other side as I described?