Muni bus drivers now have to ask their bosses to go to the bathroom during unscheduled breaks, and their union is not happy about it. It's part of a slate of rule changes. The SFMTA says it's to keep buses on the road and help the agency's struggling budget. Several Muni bus drivers told ABC7 News they are upset over the new policy that limits break time and allows for no smoking, eating, or use of cellphones.