Download A policy on geometric design of highways and streets - 2001 by American Association Of State Highway and Transportation Off PDF

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Extra resources for A policy on geometric design of highways and streets - 2001

Example text

539 Four-Level Cantilevered Freeway......................................................................... 540 Typical Cross Sections for Reverse-Flow Operation............................................... 541 Typical Reverse Roadway Terminals .................................................................... 543 Reverse-Flow Freeway ........................................................................................ 544 Typical Dual-Divided Freeway.............................................................................

The results of this approach may need to be modified to meet the needs-versus-funds problems that highway administrators face. The goal of cost-effective design is not merely to give priority to the most beneficial individual projects but to provide the most benefits to the highway system of which each project is a part. Most of the technical material that follows is detailed or descriptive design information. Design guidelines are included for freeways, arterials, collectors, and local roads, in both urban and rural locations, paralleling the functional classification used in highway planning.

A schematic illustration of this basic idea is shown in Exhibit 1-2. In Exhibit 1-2A, lines of travel desire are straight lines connecting trip origins and destinations (circles). The relative widths of the lines indicate the relative amounts of travel desire. The relative sizes of the circles indicate the relative trip generating and attracting power of the places shown. Because it is impractical to provide direct-line connections for every desire line, trips should be channelized on Exhibit 1-2.

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