You can transport your body faster by walking than by taking a car. But of course, this depends on how you design a city. If I have a supermarket 5 minute walk from home, is going to be faster than taking the car out, and finding a parking lot and finally walking to the supermarket.

And let's not forget, that if you want a more fair society, you cannot assume that just everybody can afford a car. I went to university by bus and it was a horrible experience. I could only dream of the modern cheap electric vehicles. But still, the city I studied has barely any infrastructure for this, and you risk your life every time, even though it would be PERFECT for this.