By Martin Rogers
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1 are determined through regression analysis. Manual solutions from multiple regression coefficients can be tedious and time-consuming but software packages are readily available for solving them. For a given trip generation equation, the coefficients can be assumed to remain constant over time for a given specified geographical location with uniform demographic and socio-economic factors. In developing such regression equations, among the main assumptions made is that all the variables on the right-hand side of the equation are independent of each other.
Utility defines the ‘usefulness’ in economic terms of a given activity. Where two possible trips are open to an indi- 16 Highway Engineering vidual, the one with the greatest utility will be undertaken. The utility of any trip usually results from the activity that takes place at its destination. e. the job done by the traveller for which he or she gets paid. One must therefore assume that the payment received by a given worker exceeds the cost of making the trip (termed disutility), otherwise it would have no utility or economic basis.
3. Transport planners wish to estimate the volume of car traffic for each of the links within the network for ten years into the future (termed the design year). 18. 2 Trip distribution In order to compile the trip distribution matrix, the impedance term relating to the resistance to travel between each pair of zones must be established. 17. 3. 7 S =1 S = 6475 i ij j Â (PF ) i ij j trips were attracted to zone A. 3 is used to estimate what proportion of this total amount sets out from each of the other six zones, based on the relative number of trips produced by each of the six zones and the time taken to travel from each to zone A.
An introduction to highway engineering by Martin Rogers