Various embodiments described herein relate to controlling a conveyor that comprises at least a first zone that is upstream of a second zone. A second control module associated with the second zone receives a first signal from a first control module associated with the first zone. The first signal indicates that one of a first article that has an irregular boundary or a second article that has a regular boundary exits from the first zone. The second control module controls the second drive assembly and a second brake assembly based on the indication by the first signal.