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least eight percent of the vehicular use area. Each indi- ing lots from the road, screening vehicular headlight glare vidual landscape island must be at least 100 square feet on and off site, and lessening spillover light from on-site in size, with sides measuring at least five feet in length. lighting." To accomplish these objectives, the ordinance One tree must be planted within these interior areas for requires generous buffers, with an average depth of 50 • each 100 square feet of required landscaping; three shrubs feet along the frontage of the project site. Preservation with a minimum installed height of two feet must be of existing trees and other native vegetation, a common planted for each required tree. requirement of many corridor ordinances, is mandated Automobile dealerships are given special attention in by the town's corridor overlay provisions. The review the ordinance. The provisions require six-foot-tall opaque board may require additional plantings to ensure adequate fencing around all areas used exclusively for the storage screening. of vehicles intended for sale. One automobile display pad The Cary, North Carolina, Thoroughfare Buffer Dis- per 100 feet of road frontage, however, is permitted within trict overlay zoning provisions require the preservation the 15-foot landscape buffer. Display pads may not exceed of landscaped buffer strips of between 30 and 100 feet three feet in height. in width along controlled-access highways, depending on Based on a variety of factors, the width of required the nature of the adjacent site. The terrain and the amount landscape areas and visual buffers can, and should, vary of vegetation within the required buffer area determines among corridors. Average and minimum lot sizes will, of the width of the strip and the amount of additional plant- course, significantly influence the amount of land area ing required (if any). The following standards serve as that can realistically be devoted to open space. When cor- maximum landscape planting requirements for each 100 ridor area landscaping and buffering standards are em- feet of lot frontage within the corridor: bodied in overlay ordinances, careful attention must be given to the range of permitted uses and site development Ten canopy trees (2.5-inch caliper minimum); regulations found within base district standards to ensure Fifteen understory trees (one-inch caliper minimum); that screening standards are not overly rigid. Flexible buffer strip requirements and the use of alternative corn- Sixty shrubs (six-foot minimum height at maturity); pliance standards will help ensure fairness. and - Hilton Head Island requires visual buffers for the pur- Thirty evergreen conifers (six-foot minimum height at pose of"softening the appearance of structures and park- maturity). • ,;- /e. A a 0" r Oar/364Jfifti /3•74--___„„ fi1Cdia4 :Z`� • r - 'i 111, - �`!� i Kaci f.-,/, •t 1��\� Liar✓ �%rna/ r9 P/N4 I -- �--- Theme Planting Median Common Corridor Tree Support Tree Scheme Tree Shrub Carlsbad Washington Seaforthia Cupania Informal Washington Limonium Blvd. robusta elegans anacadiodes robusta perezii (South of (Fan Palm) (King Palm) (Carrotwood Oak Ave.) ) (Fan Palm) (Statics) Myoporum Cupressus laetum macrocarpa (Myoporum) (Monter) • Cypress) 10