This prototype includes a standard two-lane local residential street, with no formal on-street parking, and with a sidewalk on one side. The cross section used for this analysis is adapted from the "Medium Road Cross Section" presented in the publication, Sustainable Neighborhood Road Design, A Guidebook for Massachusetts Cities and Towns (APA- MA, 2011). The underlying roadway design is representative of sustainable development practice for subdivisions in Massachusetts. 

Three different planting strategies have been modeled:

1. Provision of small trees (25-foot crown spread) on both sides of the street spaced at 25 feet on center.  This small-tree planting strategy represents a condition where height constraints are of concern (e.g., presence of overhead wires).
2. Provision of large trees (40-foot crown spread) on one side of the street spaced at 40 feet on-center.  This scenario contemplates the existence of either right-of-way limits or some other constraint (e.g., underground or overhead utilities) that limits the placement of trees along one side of the roadway.
3. Provisions of large trees (40-foot crown spread) on both sides of the street spaced at 40 feet on-center.  This scenario represents a fairly robust planting strategy, but is consistent with the tree spacing requirements found in a sampling of Massachusetts community subdivision regulations.

These planting strategies are depicted in the links below which show the typical placement of trees relative to the edge of pavement in each scenario.  

Subdivision Road Scenario #1 - Small Trees on Both Sides of Road

Subdivision Road Scenario #2 - Large Trees on One Side of Road

Subdivision Road Scenario #3 - Large Trees on Both Sides of Road