EXCLUSIONARY CONSTRAINTS IN TRANSPORT €� RESULTS OF QUANTITATIVE RESEARCH

Background: Among all the processes in the supply chain, transport is one of the most complex and most expensive. While planning the transportation process, one needs to consider various factors, among others the exclusionary constraints imposed on selected suppliers, products or mean of transport. Although several papers can be found where the authors discuss the problem of exclusionary constraints, it is very difficult to find one concerning the empirical research in this area. Our work tries to fill this gap. The main goal and contribution of this article is the analysis of significance and importance of various exclusions in transport present in the real life.

Methods: We present the results of a quantitative research performed on a random sample of 300 logistics services providers in Poland, concerning the exclusionary constraints in transportation.

Results: The research confirmes that the exclusion factors are an important part of activity of the companies transporting goods. Although the distributions of the frequencies are different, depending on the factor, one may observe that every factor was noticed by a significant fraction of companies. The analysis of the potential dependencies between the variables show that the importance and frequency of the factors is rather independent from the company’s features. Our study contributes to the theories and practices of logistics enterprises.

Conclusions: This study extends earlier research on exclusionary constraints with using empirical studies. In the future work we will use the results of the quantitative research to develop mathematical models of the transportation problems and we want to prepare more effective methods of planning the deliveries.