Sorry SB, didn't intend to be demeaning. Took it from your post that you and / or your group were inexperienced.
These markers do NOT upset other riders. Those in the group who (for any reason) do not wish to mark juctions are advised to stay near the rear, and to be aware that others will be making their way SAFELY through the group in order to look after them.
A marker around a fork / corner on the right may be obscured by oncoming traffic both exiting the turning and coming down the main road. Also riders trying to 'catch up' may not be looking over there..
Bottom line is fail safe. Plan for the worst, be pleased when it doesn't happen.
