Hong Kong has something like this in the city center and it works well. The entrance to many malls and buildings is on the pedestrian level, above street level.

Hong Kong has something like this in the city center and it works well. The entrance to many malls and buildings is on the pedestrian level, above street level. On the other hand in residential areas they just share the streets - the streets are small with lots of bends so it artificially limits the speed at which you can drive.