A lot of cities in Europe are actively discouraging people from taking the car to get to the city center. Either by requiring a permit to enter, making it very convoluted to get to your destination by implementing one-way streets and having a few big roads made to take on traffic, outright banning older cars with bad emission, or a combination of the above.

This is typically balanced with park & rides outside the city center, from where you can easily take public transport into the city.

Suppliers are still allowed in and are able to do so because less cars are driving there.

The city I live in has recently implemented such measures. Lots of people were complaining beforehand. But after a few years, there's not less people making it inside the city, no massive congestion, better air quality,...

Edit: not saying this is necessarily the case here. From other comments, it does seem they moved traffic underground. But my reply is still valid to your comment.