1. University of Žilina , Faculty of Operation and Economics of Transport and Communication, Department of Road and Urban Transport , Univerzitná 8215//1, Žilina 010 26 , Slovakia
2. University of Žilina , Faculty of Operation and Economics of Transport and Communication, Department of Railway Transport , Univerzitná 8215//1, Žilina 010 26 , Slovakia
3. Institute of Technology and Business , Department of Transport and Logistics , Okružní 517/10, České Budějovice 370 01, Czech Republic