That's because water gets inside the fissures and freezes, pressing against the surface. Come spring, dig out any infiltrating crabgrass and dirt, and fix the cracks for good. For asphalt, use a cold-pour filler, such as QPR Asphalt Crack Filler (about $11 at lowes.com); for concrete, use Quikrete Concrete Crack Seal (about $10; acehardware.com), then seal the whole driveway.
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