@realSiegfried @BrentToderian My Berlin experience with "bicycle streets" where in theory only cars of people who live there and emergency vehicles can go (effectively the Paris proposal I think) is that they're used as extra free parking (every 10th license plate is from out of town, so that's a rough lower bound) and as cut-through routes. The optimistic picture is that this is because hardly anything is enforced. But that is, of course, endogenous.