You should have no problem. The most direct route from MB to the station doesn't involve any of the circuit roads.
Right out of MB, past the Heineken Bar, (keep your eyes peeled for Peugeots), carry on to Pontlieu, over the river, keep an eye out for the Gare sign funnelling you left into Emile Zola (Boulevard) and there you are. Just before and just after qualifying there will be local traffic to-ing and fro-ing, but you should be ok.
H