I see what you're saying. That seems like an acceptable way to make a city walkable while having faster driving. Another idea is some kind of underground road l

I see what you're saying. That seems like an acceptable way to make a city walkable while having faster driving. Another idea is some kind of underground road layer under the city. I think the important thing is keeping as much real estate as possible for spaces where people live, work, and eat. That's what is needed anyway to have the population density to produce the tax revenue sufficient for one of these solutions.