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Table 1 Import/export freight type distribution Freight type Import Export Perishable goods 26 38 Industrial goods 19 25 Consumption goods 55 37 Total 100 100 Total (million of tons/year) 20.7 20.7.
Referring to the freight type, about the 55% of imported freight belongs to consumption goods.
origin and destination (respectively o and d); time period (h); freight type (s), e.g. perishable goods, non-perishable, and so on; average delivered/picked freight quantity (q); vehicle type (v).
If the analysis is carried out for freight type (Tables 8, 9, 10), we find a similar trend for perishable goods where the average shares to use an articulated lorry are less than 83%.
is the number of employees of zone d referred to freight type s; is the average travel generalized cost by truck between zone o and d. are model coefficients to be estimated.
are the average import and export flows of freight type s between zone o and d in time period h; are the average import and export flows estimated, respectively, by Eqs.
Similar(51)
But the humanitarian distribution centre has its own characteristics including hybrid freight types (food, medicine and general living goods, as well as a need to track rescue equipment, vehicles and on-site staff), destabilized operating circumstances, swift response to emergencies, etc.
Table 2 reports values of Open image in new window parameters calibrated for the three freight types of Table 1.
It confirms the need of using other explanatory variables for both freight flows (import and export) and freight types, as successfully done in the specification of such models reported in Eqs.
Deepening on the analysis of consumption goods, the attraction is measured by the number of inhabitants and the number of employees while for the other freight types the attraction power is explained by the number of employees, only.
It can be used for an initial estimation of the generation and attraction potentials of import/export for a given zone by considering different freight types (perishable, industrial and consumption goods).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com