Practical tips
Adding a second driver costs around €5-15/day extra. Same age and licence rules apply — under-25s incur the young-driver surcharge again.
Driving into another country
Most rentals can be driven across borders in Western Europe (Germany, Italy, Spain, Belgium, Netherlands, Switzerland) without special permission. Eastern European countries (Hungary, Czech Republic, Poland) often need pre-authorisation and a small fee. The UK, Morocco and most of North Africa are commonly excluded — check the contract.
If you're crossing into the UK, ferry and Eurotunnel companies have their own rules — most rentals from France are not allowed on the Eurotunnel without specific pre-arrangement.
One-way rentals
Picking up in one city and dropping off in another is usually possible, with a one-way fee ranging from €30 to €300 depending on distance. International one-way fees can run into four figures — only worth it for long, deliberate trips.
Mileage limits
Most French rentals come with unlimited mileage. If yours doesn't, expect a cap of 200-300 km/day with €0.20-0.50 per extra kilometre. For a multi-day road trip, unlimited is usually the better deal even at slightly higher daily rate.
Corsica and the islands
Mainland rentals are not allowed on ferries to Corsica or other French islands. Rent a car on arrival in Ajaccio, Bastia or Calvi. Same applies to French overseas territories (Réunion, Guadeloupe, Martinique).