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In the districts indicated, Section 25-65 (Surfacing) shall be modified to allow dustless gravel driveways that access one single- or two-family residence on a zoning lot, provided that all portions of such driveway located between the curb and the front lot line shall be surfaced with asphaltic or Portland cement concrete, or other hard-surfaced dustless material, at least four inches thick, and public sidewalks shall be constructed to Department of Transportation standards.