Bob's Tip of the Day: Your driveway can either absorb water or shed it. Some driveway materials, like brick and pavers, are permeable because the little spaces between them allow water back into the ground where it belongs. A driveway that’s covered in a nonporous material like concrete or asphalt needs to be pitched in a way that directs water away from your home, or it needs a drainage trench along the side to divert water.
In grass driveway technology, 'geo-grid' materials provide the necessary support structure for cars, while protecting the soil's root zone and allowing grass to grow, even in this high-traffic area. Of course, grass is permeable, and as a driveway material, it's pretty darn cool to look at.