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recorded in the Registry of Deeds or filed with the recorder of the Land Court upon final <br /> approval and signature by the Board. <br /> DESIGN SPEED - A speed selected for purposes of design and correlation of- those <br /> features of a highway, such as curvature, uperelevation and ight distance, upon which the <br /> safe operation of vehicles is dependent. <br /> DIAMETER DIAMETER AT BREAST HEIGHT dbh - As,regards,trees, the diameter <br /> of any tree trunk, measured at 4.5 feet above existing grade. <br /> DRAINAGE E - The control of surface water within the tract of land to be developed b <br /> any mans of collecting, diverting, handling, dispersing or disposal of surface runoff due to <br /> storm floorage, rainfall or natural means which has been designed by a registered professional <br /> engineer. <br /> DRIPLIIE - An area encircling the base of a tree which is delineated by a vertical line <br /> extending from the outer limit of a tree's branch tips down to the ground. <br /> ENGINEER - A registered professional engineer qualified to practice civil engineering in <br /> the Commonwealth of Massachusetts. <br /> GENERAL LANs, MASS, GENERAL LADS, G.L. or M.G.L. - The Massachusetts <br /> General Laws; Tercentenary Edition, with all additions thereto and amendments thereof. In <br /> case of rearrangement of the General Laws, any citation of particular sections-of the Genera <br /> Laws shall be applicable to the corresponding sections of the new codification, <br /> GUTTER - A shallow channel usually set along a curb or the pavement edge of a roadway- <br /> for purposes of-catching and carrying off runoff water. M ay be included In.the width of parking <br /> lanes, but not of travel, acceleration or deceleration lanes or of bicycle lanes. <br /> IMPERVIOUS SURFACE - The roof area of structures- and any horizontal surface that <br /> has been constructed or has been compacted or covered with a lager of material so that it is <br /> highly resistant to infiltration by water. <br /> ISLAND, TRAFFIC OR PARKING LOT - A raised area in a roadway, dn*veway or <br /> parking facility, usually curbed unless otherwise permitted by the Board, placed to guide traffic <br /> and separate travel or parking lanes, or used for landscaping,, signing or lighting. <br /> LEVEL of SERVICE (Los) - A -measure of the effect of a number of factors, which <br /> include speed and travel time, traffic interruptions, freedom to -maneuver, safety, driving <br /> comfort and convenience and operating costs defined, in practice, in terms of particular limiting <br /> values of certain of these factors and expressed on a scale from A to F, from best to worst. <br /> Applied to through traffic or to intersection movements. An intersection or roadway designed <br /> for a certain level of service at a specified -volume of traffic will actually operate at many <br /> different levels of service as the flow varies during an hour, and as the volume varies during <br /> different hours of the day, days of the week, periods of the year and during different gears dine <br /> to traffic growth. Unless indicated otherwise, for the purposes of these rules and regulations <br /> level of service shall be analyzed using the procedures described in the "Highway Capacity <br /> 4 <br />