1. 1 Department of Civil and Environmental Engineering, School of Engineering, University of Catania
2. 2 Department of Highway and Traffic Engineering, Cracow University of Technology
3. 3 Department of Civil and Environmental Engineering, School of Engineering, University of Catania
4. 4 Department of Civil and Environmental Engineering, School of Engineering, University of Catania
5. 5 Department of Civil and Environmental Engineering, School of Engineering, University of Catania