Paris was originally built to be traversed by walking and on horseback. It was originally built for density and walkability with roads tacked on later as an aft

Paris was originally built to be traversed by walking and on horseback. It was originally built for density and walkability with roads tacked on later as an afterthought. Many streets in the core of Paris, Rome, etc. are tiny and barely fit for cars. Not as easy in a city that grew up with cars and are have as much roadway as buildings.