If your pace line is very long and it is stopped for a light or train, and the line is blocking a driveway, the line can be cited for impeding the flow of traffic if there are cars wanting to turn into the blocked driveway and are not allowed to do so by the pace line. However, I don't think any sane LEO would sit there and cite that many riders unless it's their first month on the job, it is an extremely slow day or you are riding through a very small town that needs the money. Although there are other traffic infractions that can a pace line can violate, it will most likely not be enforced as all the members are just as culpable and there aren't too many LEO's that are going to write that many citations. I never did.