So this was kind of cool:
Each of the cities above is represented by a polar histogram (aka rose diagram) depicting how its streets orient. Each bar’s directionrepresents the compass bearings of the streets (in that histogram bin) and its length represents the relative frequency of streets with those bearings.
See the article for a more detailed look at why some of these look the way they do. One thing that’s not clear to me is if streets are weighted by their length. For example, do the big diagonal avenues count the same as a one block alley, or do they get a higher weight.