There are few 3 lanes roads in France. It's mostly the highways that cross France east-west or north-south and a couple around the biggest cities. On highways,

There are few 3 lanes roads in France. It's mostly the highways that cross France east-west or north-south and a couple around the biggest cities. On highways, the right most lane is occupied by trucks. You have to stay in the middle lane if you drive at the speed limit (130 km/h), otherwise you're swapping middle and right twice a minute to pass trucks. The peripherique around Paris is saturated. All the lanes are used at all times. It's not possible to favor the right most lane. Interesting fact. There are special rules in the french driving code for continuous stream of vehicles, for example it's prohibited to change lane unless taking a turn.