When you look into the details of these things you'll nearly always find that there are enough exemptions to make it work. If it was genuinely unliveable people wouldn't live there. People have managed to live in Venice for centuries despite it being physically impossible to get motor vehicles around the centre.
"In fact, in most streets there are no physical barriers to keep the cars out. Vehicles making deliveries or locals heading to private garages can still circulate in most places.
“What we did is to create loops to keep people from driving through the city,” Lores explains. “If you enter by the south, you leave by the south.”
The goal of this strategy, which is complemented by severe parking restrictions in all of the central area, is to get rid of what Pontevedra officials call “unnecessary traffic”.
https://www.eco-business.com/news/how-a-city-in-spain-got-ri...
"In fact, in most streets there are no physical barriers to keep the cars out. Vehicles making deliveries or locals heading to private garages can still circulate in most places.
“What we did is to create loops to keep people from driving through the city,” Lores explains. “If you enter by the south, you leave by the south.”
The goal of this strategy, which is complemented by severe parking restrictions in all of the central area, is to get rid of what Pontevedra officials call “unnecessary traffic”.