I was in Denmark where they had that. Unfortunately, they'd constantly let through "special" vehicles, just enough to pretty much ruin it.
If you get caught there you'll probably get a nice fine. And you can be sure all the pedestrians will make you drive slow.
Finally, the road usually has tiles so you don't get in there by accident, nor would you want to.
It didn't really work as a pedestrian mall. I've been in other European cities where it did work, i.e. no vehicles.
Where in Denmark was that? I don't see any loudly beeping delivery cars in Copenhagen.