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The Board may require the increase of right-of-way and <br />pavement widths if it finds that the modification in width is con- <br />sistent with the projected traffic needs and good engineering <br />practice. No variances will be granted on minimum right-of-way <br />widths for public streets. <br />3) Relation to Existing Streets <br />(a) Adjoining Areas. The pattern of streets in new <br />subdivisions shall provide for the continuation of existing <br />streets from adjoining areas, or for their proper projection where <br />adjoining land is not subdivided. <br />(b) Adjacent Areas. Where street extensions into <br />adjacent undeveloped land are necessary to insure a coordinated <br />street system, provisions for such future street or streets shall <br />be made. <br />(c) Abutting Arterials. Where a subdivision abuts <br />or contains an existing or proposed arterial street, special pro- <br />visions shall be made to minimize vehicular traffic noise to resi- <br />dential sites. The special provisions shall include one or more <br />of the following: <br />(1) marginal access streets <br />(2) Buffer Zones Additional lot depth of <br />twenty-four (24) feet plus a berm and <br />plant screening where lots are to be <br />backed to the arterial. The berm shall be <br />constructed with a slope not greater than <br />338, and the plant screening must be of a <br />type approved in the landscape ordinance <br />and must be at least twenty-four (24) <br />inches in height when planted and, <br />including the height of the berm, reach <br />six (6) feet in three years. Screening <br />foliage must produce a solid screen and be <br />of the type that will fill in at ground <br />level at maturity. Plantings shall be on <br />-49- <br />