All concrete cracks. By the nature of it's chemical properties it shrinks while hardening in a process called "hydration". In properly placed concrete, these cracks caused by shrinkage are forced into hand or machine cuts for aesthetic reasons. While we generally control the cracking, there are times when the hydration process or frost movement will cause random cracking outside of our control cuts. There is no structural or strength loss in this, only aesthetic issues. Although your driveway is designed to carry any type of passenger vehicle load, please keep heavy and extra-heavy vehicles off the concrete whenever possible (26,000# and up).