1. Northumbria University Newcastle upon Tyne NE1 8ST UK
2. School of Mechanical and Aerospace Queen's University Belfast BT7 1NN UK
3. Institute for Transport Studies University of Leeds Leeds LS1 9JT UK
4. Department of Computer Science Durham University Durham DH1 3LE UK
5. School of Computing Science University of Glasgow Glasgow G12 8QQ UK
6. School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China