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By Martin Rogers
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Additional info for An introduction to highway engineering
The ‘cost’ need not necessarily be in money terms, but can also be the time taken or lost by the traveller while making the journey. If an individual can travel to their place of work in more than one way, say for example by either car or bus, they will use the mode of travel that costs the least amount, as this will allow them to maximise the net utility derived from the trip to their destination. 2 Demand modelling Demand modelling requires that all parameters determining the level of activity within a highway network must first be identified and then quantified in order that the results output from the model has an acceptable level of accuracy.
To be computed T t¢ij – The revised trip interchange matrix (in forecasted year t¢) G tt¢i – Origin growth factor for row i (growth between year t and year t¢) G tt¢j – Destination growth factor for column j (growth between year t and year t¢). 11) (2) Check whether the origin growth factors are within approximately 5% of unity. If they are, the procedure is not required. 12) (5) Check whether the destination growth factors are within approximately 5% of unity. If they are, the procedure is not required.
They are understood to encapsulate the effect of all the characteristics of the mode not incorporated within the z terms. The ‘e’ term expresses the variability in individual utilities around the average utility of those within the market segment. 32 Highway Engineering Based on these definitions of utility, the probability that a trip maker will select one mode option, m, is equal to the probability that this option’s utility is greater than the utility of all other options. 15 are provided in McFadden (1981).