Quarter-mile pedestrian sheds with 1/8-, 1/4-, and 1/2-mile stop spacing

A few nice transportation graph images I found:
Quarter-mile pedestrian sheds with 1/8-, 1/4-, and 1/2-mile stop spacing

Image by Mulad
The effect on the pedestrian travel shed of changing stop spacing from 1/8-mile (cyan) to 1/4-mile (blue) and 1/2-mile (red). The area in red is still within 1/4 mile of a stop. I used this sawtooth method of making a graph, based on the fact that major American cities (like Minneapolis and St. Paul) tend to use right-angle street grids. (The normal

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