By Martin Rogers
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Extra resources for An introduction to highway engineering
Finding sound feasible options is an important component of the decision process. The quality of the final outcome can never exceed that allowed by the best option examined. There are many procedures for both identifying and defining project options. These include: ᭹ ᭹ ᭹ Drawing on the personal experience of the decision-maker himself as well as other experts in the highway engineering field Making comparisons between the current decision problem and ones previously solved in a successful manner Examining all relevant literature.
The choice between different potential routes is made on the basis of which has the shorter travel time. If the modelling process is to avoid becoming too cumbersome, simplifications to the complex decision-making processes within it must be imposed. Within a basic highway model, the process of simplification can take the form of two stages: (1) (2) Stratification of trips by purpose and time of day Use of separate models in series for estimating the number of trips made from a given geographical area under examination, the origin and destination of each, the mode of travel used and the route selected.
Each project must therefore be subject to an appraisal. The aim of the highway appraisal process is therefore to determine the economic, societal and environmental feasibility of the project or group of projects under examination. The process enables highway planners to decide whether a project is desirable in absolute terms and also provides a means of choosing between different competing project options, all of which have the ability to meet the stated goals and objectives of the project sponsors.