All private roads shall be screened from adjoining zoning lots by a landscaped strip at least eight feet wide, and all open off-street parking areas with five or more spaces shall be screened from adjoining zoning lots by a landscaped strip at least four feet wide. Such landscaped strips shall be densely planted with evergreen shrubs at least four feet high at time of planting, and of a type that may be expected to form a year-round dense screen at least six feet high within three years. Such screening shall be maintained in good condition at all times.