1. 1 University of Žilina , Univerzitná 8215/1, 01026 Žilina , Slovak Republic
2. 2 St. Petersburg State Transport University , 9 Moskovsky pr., Saint Petersburg, 190031 , Russia
3. 3 University of the Kielce University of Technology , Department of Automotive Engineering and Transport , Avenue Tysiąclecia Państwa Polskiego 7, 25-314 Kielce , Poland
4. 4 Russian University of Transport , 9b9 Obrazcova Street, Moscow 127994 , Russia