Small fissures and holes in asphalt can quickly expand into large gaps and potholes if snow and ice get into them.
HOW TO DO IT:
Wait for a mild day; tar-like asphalt repair products work best when pliable. Clean out loose debris in the hole, and ensure the surface is dry. Using a caulk gun, inject a sealant (try Dupont 7906 Driveway & Repair Caulk, about $18 per four-pack) into the opening. Use a wood craft stick to tamp the sealant level.
Keeping on top of minor cracks can save you $3 to $6 per square foot to resurface the whole driveway.