Entrance and exit driveways to and from any lot upon which is located a public garage or gasoline service station shall have an unrestricted width of not less than sixteen (16') feet or more than thirty (30') feet, shall be located not nearer than ten (10') feet from any lot line and shall be so laid out as to avoid the necessity of any vehicle leaving the property by backing out across any public sidewalk, street, highway, right-of-way or portion thereof.