Image d'illustration - Belga The ballet of cars registered in the North and Pas-de-Calais is uninterrupted on Monday in a Belgian service station a few hundred meters from the border: number of French motorists cross the border to mitigate the effects of the rise in fuel prices."It's been at least a year and a half since I came here, because it's two euros and a few in France. Nothing is worth Belgian gasoline for the moment," says Christine Der…