1. 1University of Žilina, Faculty of Civil Engineering Univerzitná 8215/1, 01026 Žilina, Slovakia Department of Highway Engineering Ph: +42141/5135930
2. 2University of Žilina, Faculty of Civil Engineering Univerzitná 8215/1, 01026 Žilina, Slovakia Department of Structural Mechanics Ph: +42141/5135616