After entering the race course track, not more than twelve minutes shall be consumed in the parade of horses to the post except in cases of unavoidable delay. After passing the stands once, the horses may break formation and canter, warm up or go as they please to the post. When the horses have reached the post they shall promptly be placed in their starting gate stalls in the order of their post positions, unless otherwise ordered by the starter. The starter shall see that the horses are placed in their proper positions without unnecessary delay. Causes for any delay in the start shall immediately be reported to the stewards.