Is there a device that automates toll-paying on French motorways?

I am going to France shortly and would quite like to have a prepaid or post-paid device for paying the motorway tolls. Can you advise of the best method?

Asked on 9 January 2012 by DP, Cheddar

Answered by Honest John
It's called liber-t. You get it from here: www.tolltickets.com/country/france/libert.aspx?lan...c

But if it gets stolen you automatically become liable for all the tolls it accumulates.
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