What is that supposed to look like? No stopping zones all over the residential area? That can’t be. That just doesn’t work. Where would the post office park?
Of course that works – the residential area will become a traffic-calmed zone (colloquially a play street) with only the minimum number of public parking spaces. Therefore, every car parked on the street is in a no stopping or no parking zone. Strictly speaking, that includes the post office as well.
However, the street itself is a perfectly normal six meters wide.