03 - Chapter-3 - Geometric Design Manual-2002 Chapter 3...

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Chapter 3 Geometric Design Manual-2002 Route Corridor Selection Ethiopian Roads Authority Page 3-1 3R OUTE C ORRIDOR S ELECTION 3.1 Project Cycle Projects are planned and carried out using a sequence of activities known as the “project cycle.” The cycle is composed of the following steps: identification, feasibility, design commitment and negotiation, operation, and evaluation. Route corridor selection comprises of portion of the first three of these activities. 3.1.1 I DENTIFICATION The first stage of the cycle is to find potential projects. This is sometimes known is the “pre- feasibility” stage. There are many sources from which suggestions may come, including well-informed technical specialists, local leaders, proposals to extend existing programs or projects, and from operating agencies responsible for project implementation. The decision to proceed to the feasibility stage arouses expectations for the project. Dubious projects shall therefore be rejected at the identification stage. It becomes increasingly difficult to stop a project at the later stages of the cycle. 3.1.2 F EASIBILITY The feasibility study will provide sufficient information to decide whether to proceed to a more advanced stage of planning. The level of detail of this study will depend on the complexity of the project and how much is already known about the proposal. The feasibility study shall define the objectives of the project. It shall consider alternative ways of achieving these and eliminating poor alternatives. The study provides the opportunity to mould the project to fit its physical and social environment to maximize the return on the investment. Once the feasibility study has indicated which project is likely to be the most worthwhile, detailed planning and analysis can begin. Less promising projects will have been eliminated by this time, and the selected project may be redefined and modified as more detailed information becomes available. At this stage, studies of traffic, geotechnics and design will be carried out to refine the prediction of costs and benefits and to enable an economic analysis to be carried out. 3.1.3 D ESIGN Preliminary design and feasibility are often simultaneous, but detailed design, which can be very costly (up to 15 percent of project costs), usually follows a provisional commitment to the project. Numerous decisions, which will affect economic performance, are taken throughout design; and economic appraisal often results in redesign.
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Chapter 3 Route Corridor Selection Geometric Design Manual-2002 Page 3-2 Ethiopian Roads Authority 3.1.4 C OMMITMENT AND N EGOTIATION Commitment of funds often takes place is a series of stages. This is followed by invitation to tender and negotiations with contractors, potential financiers and suppliers. At this stage, there are still considerable uncertainties.
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This note was uploaded on 11/05/2010 for the course CIVIL ce-3020 taught by Professor Era during the Spring '10 term at Trinity College Dublin.

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03 - Chapter-3 - Geometric Design Manual-2002 Chapter 3...

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