Get An introduction to highway engineering PDF

By Martin Rogers

ISBN-10: 0632059931

ISBN-13: 9780632059935

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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  (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. 18. 19 is obtained. 19 Initial output from gravity model Destination zone Origin zone A B C D E 5 905 1019 2446 1 713 8 060 4 791 740 1 547 1 201 5 418 F A B C D E F G 2053 1388 1150 1183 500 200 958 1391 1861 3947 2818 9 587 15 569 7 113 2 088 638 2361 1409 712 177 12 898 3 066 622 920 1 074 2174 Total 6475 40 900 8125 31 150 10 900 13 150 G Total 525 581 633 1 094 4 498 2 970 10 861 16 078 19 461 29 540 29 919 10 256 4 886 10 300 121 000 Forecasting Future Traffic Flows 39 vidual row does not sum to give the correct number of trips produced by each.

A more complex parabolic speed/flow relationship involves travel time increasing more quickly as traffic flow reaches capacity. In this situation, travel time is volume dependent. In order to develop a model for route choice, the following assumptions must be made: Forecasting Future Traffic Flows (1) (2) 35 Trip makers choose a route connecting their origin and destination on the basis of which one gives the shortest travel time Trip makers know the travel times on all available routes between the origin and destination.

Economic appraisal techniques can be used to justify a scheme in absolute 46 Highway Engineering terms, in which case the decision is made on the basis of whether the project is ‘economically efficient’ or not. A negative net present value or a benefit/cost ratio less than unity would indicate an inefficient scheme where society would end up worse off with the scheme than without it. The economic benefits accruing to the beneficiaries of the highway would be exceeded by economic costs incurred by those ‘losing out’ as a result of its construction.

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An introduction to highway engineering by Martin Rogers

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