Have a client that wants me to rip out their 22x25 asphalt driveway, and replace it with pavers. I have done paved walkways before. What are the main differences with a drive, how to deal with the weight of a vehicle. Obviously the sub-base will have to be heavier, more gravel, thicker sand bed. What do I need to know when dealing with a driveway as opposed to a walkway.