An apron has two jobs: load transfer and water management. Every car or delivery truck transfers weight onto the apron before any other part of the driveway, so the asphalt and base under the apron have to be built thicker than the middle of the driveway. The apron also shapes how stormwater runs from the street up onto the driveway (or, ideally, around it).
A well-built apron uses a heavier asphalt mix, a deeper compacted base, and a clean tie-in to the street curb or street edge. When any of those three is shortcut, the apron starts breaking down within a few seasons.
