Roubaix is very easy to get to, being at the junction of 5 motorways:
A1 from Paris (220km) A25 from Dunkerque (71km) and Calais (110km) A23 from Valenciennes (56km) A27 from Bruxelles (123km) A22 from Gand (73km) Anvers (124km) and Amsterdam (287km).