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e <br />Planting Strips and Street Trees <br />Design Guidelines <br />1) Street trees should be provided along all <br />arterial and collector streets to: <br />a) Separate and define the boundaries be- <br />tween pedestrian areas and vehicle use areas. <br />This separation reduces the impacts of traffic <br />volumes and speeds on pedestrians and <br />adjacent land uses; <br />b) Provide tranquility on the street, slowing <br />..the pace and intensity of street activity and <br />enhancing the well being of pedestrians and <br />motorists; <br />c) Provide shade in the summer and allow <br />sunlight in the winter; <br />d) Reduce the automobile scale of major <br />streets to human scale; <br />e) Provide the motorist with a vertical wall, <br />helping motorists to gauge their speed; <br />f) Create an outdoor room which helps <br />provide a sense of enclosure and security; <br />g) Reduce air pollution; <br />h) Provide identity to the street, orientation of <br />the street within the system of streets within a <br />city, and provide a status and prestige to <br />addresses along the street; <br />i) Reinforce the design and hierarchy of the <br />arterial and collector street system; and <br />j) Intercept rainfall and absorb stormwater runoff. <br />2) Provide continuous, uniformly and closely <br />spaced tree plantings to create a continuous <br />canopy along the length of and across the width <br />of the street. Tree spacing should connect to <br />form a continuous tree canopy over the street. A <br />minimum spacing as low as 10 feet is possible <br />depending on the tree species. Closer tree <br />plantings can be achieved when the diameter of <br />the tree trunk will remain relatively narrow. <br />58 <br />Planting strips allow for planting of large-scale, <br />high- canopy street trees on major streets <br />