we used the viamichelin website as a route planner and toll charge indicator and it was spot on ,it says 19.98e for tolls and also tells you where the tolls are,we had exact cash for them but got into the wrong lane and had to give my debit card ,i think they have exact change booths,manned booths and one where you just put your card in,all a bit scary but if we can get there and through it then anyone can!!