French drivers :
Indicate left all the time when you are on a roundabout, and only turn it off when you're leaving it; better still, do not indicate at all then nobody will be confused;
Do not overtake until you are less than 1mm from the rear bumper of the person in front;
Sit 1mm from the bumper of the person in front, even if you are not going to overtake;
Once you have overtaken, cut in and sit 1mm from the front bumper of the person behind;
When parking (esp. in Paris), if the space is not big enough, just shunt the cars either side of the space out of the way until you fit.
If you are 60 or over, the priorite a droite rule still applies to you, even at junctions where the rule has changed for everybody else
But they are very good to bikers, and in return, bikers wave a foot politely to acknowledge you if you give them room to pass.