Study on adding allowance to truck transportation of wood

Two different models were discussed in this study of calculating and adding allowance in long-distance truck transport of wood. 1. calculating and adding allowance separately for loading, unloading and driving an empty or loaded truck, 2. calculating and adding allowance for the listed operations together. The analysis was conducted in two facilities (Požega and Bjelovar) with distinctly different methods of long-distance track transportation. This resulted in significantly different d allowance, both for operations separately and in total. The research proved that the time necessary for a transportation cycle varies whether calculated by adding allowance per operation or in total. In situations with similar allowance of lower comparative value for each stage of wood transport and in situations with lower comparative value of the average allowance for all stages, as is the case in Bjelovar, both methods of adding allowance are acceptable since the difference in the cycle time is +/- 1%. In case scatterings of allowance in individual transport stages are higher and if the total allowance is higher (Požega facility) then we can expect significant differences in cycle times calculated in the aforementioned two ways. Three types of roads of different construction standard and quality of road surface were considered. The transport distance was also changed. The differences in cycle time for transport conducted on a main road are in the range of 9.39 % for 10 km distances to 3.40 % for 90 km distances. The difference span totals 14.24 %. If transport is being conducted on a tarmac forest road the cycle time differences range from 6.53 % for 10 km distances to 3.40 % for 50 km distances. The total span being 9.93 %. The differences in cycle time for transport conducted on a forest dirt road range from 2.36 % for 10 km distances to 2.97 % for 30 km distances. The difference span totals 5.33 %. Since the differences progress from negative values towards positive, at a certain distance to differences will be zero. In the researched conditions for main roads zero difference value will be achieved at a transport distance of 39 km, for tarmac forest roads this will be at 28 km and for forest dirt roads at 6 km. This indicates that at certain transport distances, with an acceptable margin of error, both ways of calculation and adding of allowance are acceptable, whereas calculation and adding of allowance outside these distances is recommended separately for each faze of wood transport.