It would be interesting to see these diagrams folded in half and into quarters. Which cities have the greatest fourfold symmetry breaking? Which cities have mor

It would be interesting to see these diagrams folded in half and into quarters. Which cities have the greatest fourfold symmetry breaking? Which cities have more streets running north than south? (the only case I can think of would be many small one-way streets in a cardinal direction, and one big counterflowing one-way street)