Most French Motorways are toll roads, so at some point you will have to stop at an automatic booth to collect a ticket (difficult without a passenger in GB RH drive cars), then whenever you leave the motorway there are pay booths where you must hand in the ticket and pay for the distance travelled either by cash or credit card.
The motorways have many service and picnic areas unlike our motorways, those with petrol garages usually also do good food and sandwiches, etc whilst the picnic area type only have very basic toilets, etc.
French drivers are much more disciplined about use of motorway lanes than us and return to the inside lanes after overtaking, this means even the 2-lane motorways flow more freely than ours but then the traffic density is also less making for much more enjoyable journeys than in the UK. Due to the tolls actually being spent on the roads (no road tax in France!) most motorways also have few roadworks and very good surfaces.
To sum up I have found that although French drivers around town are often not as polite or careful as UK drivers (they have a higher fatal accident rate, don't stop at pedestrian crossings unless people are in the road and don't understand flashing headlights the way we use them) but they are better motorway drivers in many ways and I enjoy driving in France far more than the UK. French speed cameras are low down on the motorway barriers and well signposted as 'Radar' in advance. (80mph/130km in dry).
Don't have speed camera detection on your sat nav as France has big fines if found even if not in use....I think most sat navs like TomTom have a special setting now for France.
Many French drivers leave their outside indicator flashing while in the overtaking lane and also while waiting for a slower car to move over, works well and combined with good lane discipline allows their motorways to flow much more efficiently than ours do most of the time! They all drive too close and pull out with minmal warning but you will soon get used to that....no point getting angry because they all do it, heavy trucks included.
If you see motorway traffic ahead slowing or stopping use your hazard lights to give advance warning asap to following traffic which will not have much stopping distance....
If you see a yellow diamond sign with a black line across it side roads still have priority to join the main road (see signs link below) much less common in France than it used to be thankfully !!
Yellow diamond with no line means you have priority.
French Road Signs (scroll to bottom for Priority Signs):
http://www.alltravel.../Road_Signs.htm
When I first drove in France over 20 years ago, the cars joining many roundabouts still had priority over those already on the roundabout which mean't scary confusion for all other European drivers!!
Edited by mab01uk, 15 April 2014 - 06:51 PM.