The cost of Peage (toll motorways) in France?

I know this is rather a glib question because it must depend on the route etc but approximately how much would it cost me to drive the length of France (north to south) using the peage motorways? Would it be cheaper to use the b roads when you consider the increased petrol charges and the additional cost of... show more I know this is rather a glib question because it must depend on the route etc but approximately how much would it cost me to drive the length of France (north to south) using the peage motorways?

Would it be cheaper to use the b roads when you consider the increased petrol charges and the additional cost of spending more time (food accomodation etc).

Does anyone have any experience of travelling in France in both ways?


Also How do you pay in peage. Do you pick up a ticket and then pay as you leave?
Update: Very sorry guys.

I'm travelling by Car!
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