Being a part of the "Belt System", its exit numbering is a continuation of the Belt Parkway, with exit numbers increasing north. At exit 25A (Southern State Parkway), the Cross Island Parkway becomes the Belt Parkway (more specifically, the section once known as the Laurelton Parkway). Before its exits were renumbered to align with the Belt Parkway, they were numbered to co-align with the Southern State Parkway, which is why that parkway begins with exit 13 (the Cross Island Parkway was once exits 1 to 12).