A pillar for your driveway could serve two purposes. The first reason that many people use pillars on the edge of their driveways is to create a visually interesting element. This provides a look of elegance and can fully transform the look of an outdoor space. Another reason that you could use a pillar for your driveway is so that you can attach an entry gate to it. If you want an entry gate, you will need to have some type of pillar on each side of the driveway so that you can hold it up in place.