Short span systems serve well for new mixed use designs where overall building height may be a concern. However, due to the greater number of internal columns, short span systems result in less internal visibility and reduced flow capacity. In terms of efficiency, short span parking structures range between 340 and 400 square feet per parking stall. These structures have intermediate columns in the parking module which are located 15 to 16 feet from the walls to facilitate turning into the parking space and to allow for rear passenger doors to open.
On the other hand, long span structures typically result in greater internal visibility and flow capacity. Long span parking structures generally should range between 320 to 330 square feet per parking space. These structures do not have intermediate columns in the parking module and offer a better level of service for users.