I know that you love that tree and it looks so small and harmless…..for now. Pine and weeping willow trees are especially prone to root systems that can not only crack your driveway but damage your houses foundation as well, costing thousands of dollars for repair. One rule of thumb is that a tree’s root system spreads out as far as the crown, so if you have tree branches over your driveway then you have roots underneath it as well. Prevention is a lot cheaper than repair.