1. Mechanical Engineering Department, University of the Basque Country UPV/EHU, Bilbao, Spain
2. University of the Basque Country UPV/EHU, Bilbao, Spain
3. Faculty of Civil Engineering, OTH Regensburg University of Applied Sciences, Regensburg, Germany
4. Institute for Transportation and Research Education, North Carolina State University, Raleigh, NC, USA