I have ridden the shoulder once and it was because we got stuck in traffic on 25 southbound and a couple of the bikes were overheating. I was the first rider in the line and we were doing maybe 15-20mph with traffic at a standstill we did have one dipshit somewhat pull into the shoulder to try to stop us. I agree with what has been said on here about how Americans are lunatics when it comes to "cutting in line," when I was in Europe no one cared that bikes passed on the shoulder or split a lane.