[1] Motor Transport Inst, 80 Jagiellonska St, PL-03301 Warsaw, Poland
[2] Lublin Univ Technol, Dept Sustainable Transport & Energy Sources, PL-20618 Lublin, Poland
[3] WSEI Univ, Fac Transport & Informat Technol, PL-20209 Lublin, Poland
[4] Municipal Transport Co Lublin Ltd, 56 Antoniny Grygowej St, PL-20260 Lublin, Poland