Samhällsekonomisk analys av rundvirkestransporter med 90-tonslastbilar: delprojekt inom Sammodalitetsprojektet

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Lina Jonsson
Robert Karlsson
Mohammad Reza Yahya
Mikael Ögren

The purpose of this report is to make a cost benefit analysis, showing how costs for truck transports of round wood would change if vehicles with a total weight of 90 tonnes were used instead of the 60-tonne vehicles that are currently in use. The analysis has two parts. First, costs per vehicle kilometre are presented for both vehicle sizes. This gives a good general view but does not take into account the various conditions with regard to road type, etcetera, that affect costs. Neither does it take into account that the amount of vehicle kilometres associated with round wood transports changes if larger vehicles are allowed. Therefore a scenario analysis is also performed. The basis for this analysis is simulations using the Swedish transport and logistics system Samgods. Flow estimates from Samgods are combined with road attribute data from the national road database (NVDB) to compute the total transport cost, including externalities. In these computations road type and other situation specific factors are taken into account. The scenario analysis is summarized by the total annual cost for road transports of round wood in Sweden. Due to the simulations the amount of vehicle kilometres are reduced by 21 percent if 60-tonne vehicles are replace by 90-tonne vehicles, given that the capacity of bridges is left without regard. In socioeconomic terms this equals cost reduction of 4 per cent of 163 million Swedish crowns annually. It should be kept in mind, though, that costs for improving bridge capacity, which is required for this scenario to be realized, are not included in the analysis. When 90-tonne vehicles are not allowed to pass bridges with limited bearing capacity, larger vehicles do not generally improve efficiency. There are however some important round wood transport routes where larger vehicles are possible to use without any measures to improve bridges.

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