Probability of secure return of semi-trailers to the domicicle of the carrier with regard to transport costs

The article deals with the research of the recovery of semi-trailers to the domicile of the carrier. The authors point out that, in the price for transport is not always considered the risk of finding a return for the vehicle. Some states in research have a problematic low probability of supply. The result and contribution of the article to the research itself is to compile a general mathematical formula for the state of Europe, where is the backloading to the carrier's domicile. Seasonality is also taken into account in this formula or the geographical organization of states within the continent of Europe.