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Driveways need 6-inch thick concrete for standard passenger vehicles — increase to 8 inches for trucks or RVs. Use 4,000 PSI minimum concrete and add wire mesh or rebar (#3 bars at 18" centers). Slope ¼ inch per foot away from the house for proper drainage. Seal after 30 days of curing to protect against staining and freeze-thaw damage. A 20×24 ft driveway needs approximately 8.9 cubic yards.