Forest road is a complex and cost stage of the transportation. Forest roads enables to transportation of forest products. Well planned forest road networks improve effectiveness of transport. In order to provide safe and continuous transport long timber, long vehicles such as long truck, 18 wheels needed and appropriate curve widening. In the study, CAD based horizontal driving analysis were performed on existing forest road to determine curve widening requirements for truck and semitrailer. According to results, in case of using semitrailer with 4-meter platform width curve widening area will be needed 6 times more than using truck while, platform with 5-meter curve widening area will be needed 16 times more than truck usage. Consequently, driving analysis results is a beneficial approach for decision makers to achieve optimal solution and to minimizing transport operation costs in forestry.

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