This kind of advanced city is so expensive that the middle class has to use public transportation, even when they wish to ride a car.
That's not about the rich. Really rich people do not use public transportation, they can afford a car with a driver, or a helicopter even in the most expensive cities.
Taxis exist all over Europe, even though middle class often uses the public transportation.
So I would rephrase this quote as An advanced city is the one where public transportation is clean, safe, time-reliable and abundant (covers most of the city/metropolis).