And we're not talking the side of the road nominally called a bike lane in which busses drive, cars and delivery vans double park, etc; we're talking separated by a raised curb on the opposite side from parked cars bike lane.
In case you are confused when the curb goes away in the intersections, just follow the guys on bikes.
As Rolf had alredy described, we're close to Longchamps in the Bois de Boulogne. Much of the loop is either completely dedicated to bike traffic (as long as there isn't a horse race going on) or at least reasonably protected from car traffic. It is a great, if boring, place to do flat intervals- you can do loops forever without having to stop. When I've done training rides on early weekday mornings, there were a few other people out. But on weekends, it's a mob scene.