diff --git a/docs/design/notes/demand.md b/docs/design/notes/demand.md
index 9b46cdea88..ce7b5b5d85 100644
--- a/docs/design/notes/demand.md
+++ b/docs/design/notes/demand.md
@@ -1,9 +1,5 @@
 # Demand data
 
-- https://en.wikipedia.org/wiki/Transportation_forecasting
-- https://data.seattle.gov/Transportation/2016-Traffic-Flow-Counts/f22b-ywut
-	- counts per aterial
-
 ## Depicting
 
 Axes:
@@ -16,3 +12,29 @@ Fix a time, then show a bunch of directed arrows between neighborhood polygons.
 Line thickness relative to number of trips. Color coding... if you're
 interested in a particular neighborhood, vary all the line colors based on
 src/dst.
+
+## Sources
+
+- https://en.wikipedia.org/wiki/Transportation_forecasting
+- https://data.seattle.gov/Transportation/2016-Traffic-Flow-Counts/f22b-ywut
+	- counts per aterial
+
+- high priority
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-means-of-transportation-to-work-acs-b08301-transportation
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-travel-time-to-work-acs-b08303-traveltime
+https://gis-kingcounty.opendata.arcgis.com/datasets/consolidated-demographics-index-for-king-county-census-tracts-demographic-index-area
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-household-size-by-vehicles-available-acs-b08201-householdvehicles
+
+
+- indications of population
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-total-population-acs-b01003-totalpop
+
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-units-in-structure-acs-b25024-unitsinstructure
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-household-type-including-living-alone-acs-b11001-householdtype
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-housing-units-acs-b25001-housingunits
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-occupancy-status-acs-b25002-occupancystatus
+https://gis-kingcounty.opendata.arcgis.com/datasets/acs-household-size-by-number-of-workers-in-household-acs-b08202-householdworkers
+
+- goldmine, but seemingly very hard to interpret
+https://www.psrc.org/trip-based-travel-model-4k
+https://www.psrc.org/activity-based-travel-model-soundcast
diff --git a/editor/src/render/extra_shape.rs b/editor/src/render/extra_shape.rs
index 2ce385b847..3e004d5710 100644
--- a/editor/src/render/extra_shape.rs
+++ b/editor/src/render/extra_shape.rs
@@ -3,7 +3,7 @@ use crate::render::{
     DrawCtx, DrawOptions, Renderable, EXTRA_SHAPE_POINT_RADIUS, EXTRA_SHAPE_THICKNESS,
 };
 use ezgui::{Color, GfxCtx};
-use geom::{Circle, Distance, FindClosest, GPSBounds, PolyLine, Polygon, Pt2D};
+use geom::{Circle, FindClosest, GPSBounds, PolyLine, Polygon, Pt2D};
 use kml::ExtraShape;
 use map_model::{DirectedRoadID, Map, LANE_THICKNESS};
 use std::collections::BTreeMap;
@@ -44,8 +44,14 @@ impl DrawExtraShape {
                 attributes: s.attributes,
                 road: None,
             })
+        } else if pts[0] == *pts.last().unwrap() {
+            Some(DrawExtraShape {
+                id,
+                polygon: Polygon::new(&pts),
+                attributes: s.attributes,
+                road: None,
+            })
         } else {
-            let width = get_sidewalk_width(&s.attributes).unwrap_or(EXTRA_SHAPE_THICKNESS);
             let pl = PolyLine::new(pts);
             // The blockface line endpoints will be close to other roads, so match based on the
             // middle of the blockface.
@@ -56,7 +62,7 @@ impl DrawExtraShape {
                 .map(|(r, _)| r);
             Some(DrawExtraShape {
                 id,
-                polygon: pl.make_polygons(width),
+                polygon: pl.make_polygons(EXTRA_SHAPE_THICKNESS),
                 attributes: s.attributes,
                 road,
             })
@@ -84,16 +90,3 @@ impl Renderable for DrawExtraShape {
         self.polygon.clone()
     }
 }
-
-// See https://www.seattle.gov/Documents/Departments/SDOT/GIS/Sidewalks_OD.pdf
-fn get_sidewalk_width(attribs: &BTreeMap<String, String>) -> Option<Distance> {
-    let base_width = attribs
-        .get("SW_WIDTH")
-        .and_then(|s| s.parse::<f64>().ok())
-        .map(Distance::inches)?;
-    let filler_width = attribs
-        .get("FILLERWID")
-        .and_then(|s| s.parse::<f64>().ok())
-        .map(Distance::inches)?;
-    Some(base_width + filler_width)
-}