U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-HRT-11-064 Date: November 2011|
Publication Number: FHWA-HRT-11-064
Date: November 2011
The result of this study was to provide recommendations on the management, planning, and conduct of traffic analysis that will promote greater traffic analysis tool consistency over the typical project development life cycle. It has been directed toward professionals operating in State departments of transportation and other agencies responsible for transportation project development and delivery.
A transportation improvement project typically goes through the following six stages in the development life cycle, although this varies by transportation agency:
In the early stages of project development, relatively little has been defined about the project. Consequently, the traffic analysis has to be relatively broad and comprehensive in the early stages, with the focus of the analysis increasing as the project and its alternatives are better defined in the later stages.
The key to managing consistency of the traffic analyses throughout the various stages of project development is a PDAP that is scaled to the needs of each stage of the process. The PDAP is a scalable master scope that describes the project, its purpose, and the objectives of the traffic analysis. It identifies the MOEs that are used to evaluate the project and its alternatives, describes the traffic analysis approach (including tools, assumptions, and parameters), identifies the risks and contingency plans for dealing with those risks, determines the resource requirements, and lays out the time schedule for the analysis. This document has provided details and advice on the contents of the PDAP as well as information on how to utilize outputs from different analysis tools and visualization and communication aides.