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6) Large-scale, deciduous, canopy trees are <br />preferred for street tree plantings <br />7) Select tree species whose canopies do not <br />encroach into pedestrian headroom or into tall <br />curbside vehicles such as buses. <br />8) Preserve existing mature trees through flexible <br />street designs, where possible. <br />9) Encourage agreements with private develop- <br />ers and landowners to plant and maintain trees <br />_ and other right-of-way plantings. <br />10) Ensure proper sight distance and other safety <br />considerations in designing and landscaping <br />planting strips. Maintenance of street trees <br />within planting strips and medians should be <br />ensured to avoid reduction of sight distance. <br />Certain trees with small trunk diameters can be <br />brought forward, especially in conjunction with <br />the use of curb extensions. <br />11) Consider the potential for utilizing planting <br />strips and medians for stormwater treatment <br />purposes. <br />12) The width of a planting strip between curb and <br />sidewalk should be based on the cross section <br />drawings (Figures 36-56 in this document). The <br />minimum planting strip widths shown in these <br />figures shall be regarded as strongly preferred. Total <br />width will be determined by available (or obtain- <br />able) right-of-way, other design features, and site- <br />specific constraints. <br />13) Generally, street trees shall be spaced at <br />intervals between 10 and 50', depending on the <br />species. The average spacing of street trees is 30'. <br />14) Trees at the ends of medians should be <br />maintained with a high canopy to maintain sight <br />distance and permit space for traffic control <br />devices on the median nose. Median tree <br />planting should be extended to the intersection if <br />median widths permits and the median is not <br />required for traffic control devices. <br />15) Along Minor Arterial, Major Collector and <br />Neighborhood Collector streets, planting strips <br />and parking lanes may be constructed within the <br />same area, as depicted in Figure 8. <br />16) Street trees should be planted a minimum of <br />35' from the midpoint of the tangent of the curb <br />radius at any intersection. <br />60 <br />Routine tree maintenance is necessary to ensure <br />healthy street trees <br />