Driving in France : the one
big difference
When driving in a city, town or village, the right of way at an intersection (whether it is a crossroads or simply a minor road) is automatically given to the vehicle on the right - la priorité à droite - unless otherwise indicated by stop or give way signs.

This rule applies even in the case of a small side road entering a major main road. The vehicle travelling on the main road must stop and give way to the vehicle entering on the right from the minor road. This leads to much confusion for non-French drivers, many near misses and a few collisions.

You really should know what these two road signs (pictured below) mean as they do not exist in the UK but can have a major impact - not literally we hope - in France.
This road sign indicates that you are on the main road and have the right of way. You will see this symbol in a village or small town. Use caution on roundabouts and on country roads when there is traffic entering from your right.  Not all drivers in France observe the right of way rules.
This road sign with the black bar through the yellow square indicates that right of way for vehicles on the main road has ended and that if you are on the main road you must give way to traffic entering from the right, no matter how minor that road may be.