If you should have a collision in France, you will need to fill out a “constat amiable” (translated as a “friendly observation”). This document is supplied by your insurance company and is normally found in your glove compartment.
The document can be slightly intimidating. A copy in English can be seen here :
Since 2014, in circumstances where there are no more than 2 vehicles involved, an electronic submission can be made via a smartphone.
The link to the e-constat can be found here: