1. Senior Lecturer, Nottingham Centre for Pavement Engineering, Univ. of Nottingham, University Park, Nottingham, NG7 2RD, UK.
2. Researcher, Nottingham Centre for Pavement Engineering, Univ. of Nottingham, University Park, Nottingham, NG7 2RD, UK.
3. Reader, Nottingham Centre for Pavement Engineering, Univ. of Nottingham, University Park, Nottingham, NG7 2RD, UK.