Concrete driveway cracks can be one of the most frustrating things for any homeowner. When you understand what causes the cracks, then you can prevent them. If there is a large tree within 10 yards of your driveway, then it needs to be removed immediately. Over time, the roots from that tree will grow under your concrete driveway and start pushing up, causing cracks. If you see small cracks in your driveway just starting, fill them in immediately. You should also seal your driveway once a year. If moisture gets into your driveway, then it will expand when it freezes in the winter, and crack the concrete.