I think if you regularly ride in paceline in places with lights, and the group chooses to stop at those lights, one learns quickly the dynamics of stopping safely on reds. With a little group communication and heads up by all riders approaching lights, it's not that hard. I do know when we have guest riders from other states/cities with few lights that they often comment on the stop and go nature of such rides and how well it is handled (and how it can lead to quite a workout)
Al