The corridor includes natural and manmade components ranging from wildlife trails to rail lines. The natural corridors are formed by the assembly of natural, agricultural, and recreational open spaces, such as parks, school yards, and golf courses. These continuous spaces can be part of a larger network, connecting the urban open spaces to the countryside. The transportation corridor is determined by its intensity. Heavy rail corridors should remain tangent and external to all urbanized areas. Light rail and streetcar corridors may occur at boulevards at the edges of neighborhoods. Bus corridors may pass into neighborhoods on streets. The corridor may also be a continuous parkway, providing long-distance walking and bicycle trails. The corridor should not be the residual space bounding separate zones. Rather, it is a public element characterized by its visible continuity. | The neighborhood includes a balanced set of activities: shopping, work, schooling, recreation, and dwelling. This is particularly useful for those such as the young, old, or handicapped. The neighborhood provides business incubators as well as housing for a variety of lifestyles. Inclusive housing refers to the housing needs of people at all stages of life. The neighborhood has a center and an edge which contribute to the identity of the community. The center is a public space, which may be a plaza, a square, a green, or an important street intersection. It is located near the center of the neighborhood, unless compelled by a geographic circumstance to be elsewhere. Eccentric locations may be justified by a shoreline, a transportation corridor, or a compelling view. The center is the appropriate location of the neighborhood's public buildings. Shops and workplaces are usually associated with the center. In the aggregation of neighborhoods which create towns and cities, these buildings should be at the edge, where they gain synergy as neighborhoods connect. The edges of a neighborhood vary in character. In villages, the edge is usually defined by open space. In towns and cities, the edge is often another neighborhood or transportation corridor. | The optimal size of a neighborhood is a quarter mile from center to edge. This distance is the equivalent of a five-minute walk at an easy pace. This limit assures a population within walking distance of many of its daily needs. This size is determined, not by density but by a maximum walking radius. Larger areas are reapportioned as multiple neighborhoods. Smaller areas should be concurrently planned with adjoining holdings. A transit stop within walking distance of most homes enhances the usefulness of public transportation. The neighborhood is structured on a fine-grained network of thoroughfares to shorten pedestrian routes. This interconnecting street pattern provides multiple routes that diffuse traffic, keeping local traffic off regional roads and through traffic off local streets. Neighborhood thoroughfares are designed to provide equitably for pedestrian comfort and for automobile movement. Pedestrian activity encourages the casual meetings that form the bonds of community. The neighborhood identifies appropriate locations for civic buildings. These enhance community identity and foster community participation. | The district is restricted from allowing the full range of activities of a neighborhood. A district is only justified to accommodate uses that cannot be incorporated into the neighborhood structure. Examples are theater districts, capitol areas and college campuses. Other districts accommodate large scale transportation or manufacturing uses, such as airports, container terminals, refineries, and "big-box" retailing. The structure of the district should parallel that of the neighborhood: an identifiable focus encourages orientation and identity, while clear boundaries facilitate the formulation of special management organizations. Interconnection with adjacent neighborhoods encourages pedestrian access. Districts benefit from transit systems, and should be located within the regional network. Districts must be justified by a public process leading to approval by the appropriate public body. |