Through our American Express card we had collision insurance and loss-of-use coverage on the car we rented in Rouen for one week. We were unable to make ourselves understood at the Hertz rental counter that we wanted to purchase additional liability insurance only to cover damage to the other driver's car, property damage or medical. The agent's English was passably good (we speak no French), but the concept of liability insurance vs. collision seemed alien to her. We ended up just taking Hertz's insurance package, with my husband being paranoid that should we have an accident his American Express coverage would be nullified by virtue of us having bought a full package from Hertz. Six days rental on a small car (Clio) cost us 539E/$859.76 -- this was 222E for the car, 132E for insurance and the rest various taxes and local fees. And there was an additional $17.95 for the AmEx protection.
For future reference, was our American terminology (collision vs. liability) at fault? Do they call it something different in France? Or was our agent clueless? Or is it simply not possible to unbundle collision from liability insurance on a rental car policy?