During my work week I ride in a commute van, in the #1 lane, and as such I see a lot of riders splitting lanes. It seems a lot of the riders are going way too fast while splitting to be safe. At least IMHO. Then this last weekend I saw not one Motorcycle but a whole club of bikes passing on the Right, shoulder side of a one lane road, going past the long line of stopped cars. Is that even legal? Plus I would think it would give a negative opinion to cagers of bike riders in general. I was surprised as I was sitting in traffic as I was in a solid yellow (no passing) line part of the road, and here come about 20 bikes on my Right. So what is legal? VS what is acceptable VS what is the proper way? The rules I have read were very vague to say the least.