CTC rides that i go on, are limited to around 20 to avoid being too large a pack
The local clubs meet at the same point on a Sat morning and tend to share a similar first 20 km before heading off on their own routes. In the height of summer, there are frequently well over 100 cyclists spinning along as one massive peloton, definitely blocking the road and when we hit the dual carriageway, the group often spills over onto the 2nd lane. It is definitely a moving road block. The local drivers take it pretty well and do manage to get through or past. The acceptance of a group of cyclists is just so completely different over here.