Checklist :

• Driving licence
• Proof of vehicle ownership or hire
• Vehicle insurance
• Headlamp beam deflector
• Spare set of bulbs
• Breathalyzer kit
• Hazard warning triangle
• Spare set of car keys
• High-visibility waistcoats
• Vehicle condition
• Maps or Satnav

• ► Driving licence. When driving in France, you will need a recognised full driving licence. An international licence is not required for short term visitors (up to 90 days) from countries of the EU, EEA, USA, Canada; however it is either recommended or else required for visitors from other countries. For specific details, check with the local French embassy in your country of origin.
  NB: The  minimum age for driving in France is 18, so drivers under the age of 18 cannot drive in France, even if they have a full driving licence issued in their own country.
• Personal ID. Anyone visiting France must have a valid personal ID card. For visitors from countries like the UK which do not issue ID cards, a valid passport is required. Travellers not holding a European Union or North American passport may need to obrain a tourist visa. For further details consult this official French foreign ministry website in English. 
• For longer stays, standard EU driving licences remain valid, but holders of driver's licenses from non-EU countries will probably need to obtain a French licence. Again, check with the French embassy in your country before starting off on your trip.
• ► Proof of ownership, This is the car's registration certificate (for cars registered in the UK, the V5C certificate). If stopped by the police, you may well be asked for the "Carte grise" (grey card) : it is the vehicle's registration certificate that you are being asked to show.
• ► Proof of insurance. The standard international and European insurance document is the "green card", though a standard insurance document from any EU country provides basic insurance for your vehicle (third party cover) throughout the Union, whether or not a green card is provided. As regards the extent of you vehicle insurance cover, you should check with your insurance company before setting off for France or beyond. Many insurance policies that are comprehensive policies in the UK only provide third party cover when the vehicle is taken abroad.
•     Many UK motorists like to take out extra holiday insurance, such as that available from the AA, to cover the costs of emergency repairs and/or repatriation of the vehicle and passengers in the event of a major mishap. Click to visit the AA website.
• ► Headlamp beam deflector.  Depending on your car, you will either need deflector patches or have to adjust the beam manually. In the UK, headlamps dip to the left, which is a big problem when driving at night on the continent, as that means they dip into the path of oncoming traffic. Beam deflectors (often just a bit of opaque tape to stick on a part of the headlamp) correct this.
• ► Spare set of bulbs.  Though it is highly unlikely that you will be stopped and asked to show your spare set of bulbs, and though it is not practical to carry spare sealed-beam units that require a garage visit for fitting, French rules of the road require cars to carry a spare set of bulbs. Many French drivers do not carry them.....
• ► Breathalyzer kit. or alcohol level test. In theory, it has been obligatory to carry one of these since 1st March 2013 - but there is no penalty for not having one.
• ► Hazard warning triangle.  A red reflective triangle that can be placed at a suitable distance behind a car if it is immobilised on the highway or hard shoulder
• ► Spare set of car keys.  Not obligatory, but highly recommended. After all, it would be unimaginable hassle to lose your keys, then have no way of getting into your car... or once in it, of starting it.
• ► High viz waistcoats.  All cars are required by law to carry a high-visibility waistcoat (fluorescent yellow or orange). This must be carried IN the car, not in the boot (not in the trunk), so that it can be slipped on immediately by any driver who needs to get out of an immobilised vehicle, notably on a motorway or main road.
• ► Vehicle condition .  Don't set out on a long journey to France or beyond, to Italy or Spain or wherever, without having first had your car serviced or checked. In particular, check tyre pressure and condition.
• ► Maps or Satnav .  One or the other of these is always advisable, even if you are planning a simple journey on motorways or main roads. Detailed local maps can help you in the event of the unforeseen. They can also help drivers of larger vehicles - coaches, HGVs, caravans or motorhomes - avoid unsuitable roads before they actually reach them.  Satnavs are quite good at forgetting to mention bits of vital information, such as low bridges or narrow bridges on minor roads.