I had a new concrete driveway poured last september. I noticed in February while I was shoveling snow that a long, fine crack had appeared in the interim, about 14 feet long. A few days ago, I noticed yet another crack criss-crossing the old crack. I am not a driveway expert, and I wonder if this is kind of early for things to be "cracking" up. The cracks are not superficial, they go all the way through to the bottom of the slabs.