Liquidy Thicket and a Series of Unhygienic Events

• sped up initial loading of the LTN tool on web by splitting it from the main A/B Street binary
• LTN UX: preserve dropdown settings and saved routes
• draw LTN cells as proper polygons, always clipped to the neighborhood boundary (instead of a grid)
• support LTN GeoJSON export in web
• prototyped an impact prediction for LTN schemes by comparing per-road volumes using a demand model. Not working yet.