It's illegal in Florida. Lets look at this with some logic. If everon that was riding in a group were allowed to stop traffic to get their group through alot of people would start objecting. Like my car club has a grouop ride we should be able to stop traffic to get our group through. Then were does it end? In Florida only police and escorted funeral processions have a priorty. If your group puts a rider out to stop traffic they could be ticketed for impeding traffic. If you only block one lane of a 2 lane same direction roadway you might not be ticketed, but both lanes or an intersection you will bet a ticket.