We have P+R also in France, in Paris it’s called parking relais, there is 83 of them with 23000 parking spot. But even in smaller town (I live near Grenoble and there is P+R, sadly not use at is full potential because public transport in some are not up to pace, but its getting better) It is still a good idea :) hard to implement well, and it need a lot more that just parking spot to be useful.
Thanks for sharing it’s very interesting :)