1. Swedish Transport Administration, Gibraltargatan 7, Malmö, Sweden
2. Lund University, Division of Building Materials, Box 118, SE- 221-00, Lund, Sweden
3. Université Libre de Bruxelles (ULB), École polytechnique de Bruxelles (Brussels Faculty of Engineering), Laboratory of Image Synthesis and Analysis (LISA). Campus de Solbosch - CP 165/57, Avenue Franklin D. Roosevelt 50, B-1050 Brussels, Belgium