Its trunk rests upon the elevated station, passes through the main business district, and terminates at the community center. In both design and landscape treatment the common and the central buildings constitute an interesting and significant neighborhood community center. Trail design objectives The most common feature of many greenways is a trail, which principally defines a land-based path but can also include waterways, navigable as a “trail.” In all cases, design must meet specific purposes, which may include some or all of the following objectives: • Safety: to indicate where it is safe to pass, and indicating whether or not marked trails have been inspected to remove obvious hazards, including f alls, rock slides, overhang ing limbs, management of poison ivy, etc. • Way-finding: often assisted by trail maps, and best introduced by an easily understood map at the entry trailhead, Ideally, trails and choices of paths and direction should be identified in terms of length and time (average adult). The average net ground area per family amounts to 1,003.7 square feet. The average business frontage per family provided by the plan is about 2.3 feet. Fig. 2 Diagram suggesting the type of plan that might be devised for a more central area in the neighborhood of industry and business. Fig. 2 is a sketch of the kind of layout, which might be devised for a district in the vicinity of factories and railways. Shopping district. Small shopping districts are located at each of the four corners of the development. Branches, covering all sections of the unit, facilitate easy access to the school, to the main street stem, and to the business district. Next to them, separated only by a narrow service street, is a row of apartments, whose main outlooks will all be directed toward the interior of the unit and its parked open spaces.