I recently built a home that has a concrete driveway. Knowing that the driveway would crack if joints were not put into the driveway I asked the builder if he was going to come back and cut expansion joints in it. I was told that it would not be cut but the driveway had internal joints installed so that it would crack at strategic locations. I now have linear cracks across the driveway but what concerns me is the constant wear over the cracks from our cars. I'm afraid that eventually the concrete will start chipping out of the cracks. Should I be concerned?